20257534 has 16 divisors (see below), whose sum is σ = 34894080. Its totient is φ = 8723160.

The previous prime is 20257529. The next prime is 20257547. The reversal of 20257534 is 43575202.

It is a super-2 number, since 2×20257534² = 820735367522312, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23814 + ... + 24649.

It is an arithmetic number, because the mean of its divisors is an integer number (2180880).

Almost surely, 2^20257534 is an apocalyptic number.

20257534 is a deficient number, since it is larger than the sum of its proper divisors (14636546).

20257534 is a wasteful number, since it uses less digits than its factorization.

20257534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48495.

The product of its (nonzero) digits is 8400, while the sum is 28.

The square root of 20257534 is about 4500.8370332639. The cubic root of 20257534 is about 272.6018876633.

It can be divided in two parts, 2025 and 7534, that added together give a palindrome (9559).

The spelling of 20257534 in words is "twenty million, two hundred fifty-seven thousand, five hundred thirty-four".