136442020 has 72 divisors (see below), whose sum is σ = 339248952. Its totient is φ = 45788160.

The previous prime is 136441961. The next prime is 136442027. The reversal of 136442020 is 20244631.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6071296 + 130370724 = 2464^2 + 11418^2 .

It is a super-5 number, since 5×136442020⁵ (a number of 42 digits) contains 55555 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 136441982 and 136442000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136442027) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29292 + ... + 33628.

It is an arithmetic number, because the mean of its divisors is an integer number (4711791).

Almost surely, 2^136442020 is an apocalyptic number.

136442020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 136442020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (169624476).

136442020 is an abundant number, since it is smaller than the sum of its proper divisors (202806932).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

136442020 is a wasteful number, since it uses less digits than its factorization.

136442020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4381 (or 4368 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 136442020 is about 11680.8398670644. The cubic root of 136442020 is about 514.8128518476.

Adding to 136442020 its reverse (20244631), we get a palindrome (156686651).

The spelling of 136442020 in words is "one hundred thirty-six million, four hundred forty-two thousand, twenty".