20136220 has 24 divisors (see below), whose sum is σ = 45539424. Its totient is φ = 7434816.

The previous prime is 20136217. The next prime is 20136227. The reversal of 20136220 is 2263102.

It is a junction number, because it is equal to n+sod(n) for n = 20136194 and 20136203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20136227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38464 + ... + 38983.

It is an arithmetic number, because the mean of its divisors is an integer number (1897476).

Almost surely, 2^20136220 is an apocalyptic number.

20136220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20136220 is an abundant number, since it is smaller than the sum of its proper divisors (25403204).

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

20136220 is a wasteful number, since it uses less digits than its factorization.

20136220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77469 (or 77467 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 20136220 is about 4487.3399692914. The cubic root of 20136220 is about 272.0566310862.

Adding to 20136220 its reverse (2263102), we get a palindrome (22399322).

The spelling of 20136220 in words is "twenty million, one hundred thirty-six thousand, two hundred twenty".