20404538 has 32 divisors (see below), whose sum is σ = 39201408. Its totient is φ = 7732800.

The previous prime is 20404493. The next prime is 20404547. The reversal of 20404538 is 83540402.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3908 + ... + 7488.

It is an arithmetic number, because the mean of its divisors is an integer number (1225044).

Almost surely, 2^20404538 is an apocalyptic number.

20404538 is a deficient number, since it is larger than the sum of its proper divisors (18796870).

20404538 is a wasteful number, since it uses less digits than its factorization.

20404538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3638.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 20404538 is about 4517.1382533635. The cubic root of 20404538 is about 273.2597009012.

The spelling of 20404538 in words is "twenty million, four hundred four thousand, five hundred thirty-eight".