20257232 has 10 divisors (see below), whose sum is σ = 39248418. Its totient is φ = 10128608.

The previous prime is 20257219. The next prime is 20257247. The reversal of 20257232 is 23275202.

It can be written as a sum of positive squares in only one way, i.e., 12988816 + 7268416 = 3604^2 + 2696^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20257198 and 20257207.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 633023 + ... + 633054.

Almost surely, 2^20257232 is an apocalyptic number.

It is an amenable number.

20257232 is a deficient number, since it is larger than the sum of its proper divisors (18991186).

20257232 is a wasteful number, since it uses less digits than its factorization.

20257232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1266085 (or 1266079 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 23.

The square root of 20257232 is about 4500.8034838237. The cubic root of 20257232 is about 272.6005330039.

The spelling of 20257232 in words is "twenty million, two hundred fifty-seven thousand, two hundred thirty-two".