20541904 has 20 divisors (see below), whose sum is σ = 39870340. Its totient is φ = 10252800.

The previous prime is 20541901. The next prime is 20541949. The reversal of 20541904 is 40914502.

It can be written as a sum of positive squares in 2 ways, for example, as 3069504 + 17472400 = 1752^2 + 4180^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20541901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16504 + ... + 17704.

It is an arithmetic number, because the mean of its divisors is an integer number (1993517).

Almost surely, 2^20541904 is an apocalyptic number.

It is an amenable number.

20541904 is a deficient number, since it is larger than the sum of its proper divisors (19328436).

20541904 is a wasteful number, since it uses less digits than its factorization.

20541904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2278 (or 2272 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 20541904 is about 4532.3177293742. The cubic root of 20541904 is about 273.8715365619.

The spelling of 20541904 in words is "twenty million, five hundred forty-one thousand, nine hundred four".