20256537 has 32 divisors (see below), whose sum is σ = 34117632. Its totient is φ = 10416384.

The previous prime is 20256521. The next prime is 20256539. The reversal of 20256537 is 73565202.

It is not a de Polignac number, because 20256537 - 2⁴ = 20256521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20256539) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6978 + ... + 9444.

It is an arithmetic number, because the mean of its divisors is an integer number (1066176).

Almost surely, 2^20256537 is an apocalyptic number.

It is an amenable number.

20256537 is a deficient number, since it is larger than the sum of its proper divisors (13861095).

20256537 is a wasteful number, since it uses less digits than its factorization.

20256537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2517.

The product of its (nonzero) digits is 12600, while the sum is 30.

The square root of 20256537 is about 4500.7262747250. The cubic root of 20256537 is about 272.5974154418.

The spelling of 20256537 in words is "twenty million, two hundred fifty-six thousand, five hundred thirty-seven".