20142356 has 72 divisors (see below), whose sum is σ = 42565320. Its totient is φ = 8273664.

The previous prime is 20142349. The next prime is 20142359. The reversal of 20142356 is 65324102.

It can be written as a sum of positive squares in 4 ways, for example, as 3610000 + 16532356 = 1900^2 + 4066^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20142359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 544370 + ... + 544406.

It is an arithmetic number, because the mean of its divisors is an integer number (591185).

Almost surely, 2^20142356 is an apocalyptic number.

20142356 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20142356 is an abundant number, since it is smaller than the sum of its proper divisors (22422964).

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

20142356 is a wasteful number, since it uses less digits than its factorization.

20142356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121 (or 100 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 20142356 is about 4488.0236184762. The cubic root of 20142356 is about 272.0842623886.

Adding to 20142356 its reverse (65324102), we get a palindrome (85466458).

The spelling of 20142356 in words is "twenty million, one hundred forty-two thousand, three hundred fifty-six".