20625506 has 16 divisors (see below), whose sum is σ = 33929280. Its totient is φ = 9325680.

The previous prime is 20625499. The next prime is 20625529. The reversal of 20625506 is 60552602.

It is a happy number.

It is a super-2 number, since 2×20625506² = 850822995512072, which contains 22 as substring.

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, 1955 + ... + 6713.

It is an arithmetic number, because the mean of its divisors is an integer number (2120580).

Almost surely, 2^20625506 is an apocalyptic number.

20625506 is a deficient number, since it is larger than the sum of its proper divisors (13303774).

20625506 is a wasteful number, since it uses less digits than its factorization.

20625506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4969.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 20625506 is about 4541.5312395711. The cubic root of 20625506 is about 274.2425702797.

It can be divided in two parts, 20 and 625506, that added together give a palindrome (625526).

The spelling of 20625506 in words is "twenty million, six hundred twenty-five thousand, five hundred six".