20504740 has 24 divisors (see below), whose sum is σ = 44546040. Its totient is φ = 7918848.

The previous prime is 20504719. The next prime is 20504741. The reversal of 20504740 is 4740502.

It can be written as a sum of positive squares in 4 ways, for example, as 8726116 + 11778624 = 2954^2 + 3432^2 .

It is not an unprimeable number, because it can be changed into a prime (20504741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17097 + ... + 18256.

It is an arithmetic number, because the mean of its divisors is an integer number (1856085).

Almost surely, 2^20504740 is an apocalyptic number.

20504740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20504740 is an abundant number, since it is smaller than the sum of its proper divisors (24041300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20504740 is a wasteful number, since it uses less digits than its factorization.

20504740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35391 (or 35389 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 22.

The square root of 20504740 is about 4528.2159842481. The cubic root of 20504740 is about 273.7062758993.

The spelling of 20504740 in words is "twenty million, five hundred four thousand, seven hundred forty".