20523808 has 24 divisors (see below), whose sum is σ = 40508748. Its totient is φ = 10235904.

The previous prime is 20523791. The next prime is 20523809. The reversal of 20523808 is 80832502.

It can be written as a sum of positive squares in 2 ways, for example, as 20178064 + 345744 = 4492^2 + 588^2 .

It is not an unprimeable number, because it can be changed into a prime (20523809) 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, 21060 + ... + 22012.

Almost surely, 2^20523808 is an apocalyptic number.

It is an amenable number.

20523808 is a deficient number, since it is larger than the sum of its proper divisors (19984940).

20523808 is an equidigital number, since it uses as much as digits as its factorization.

20523808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1636 (or 1628 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 20523808 is about 4530.3209599321. The cubic root of 20523808 is about 273.7910922933.

The spelling of 20523808 in words is "twenty million, five hundred twenty-three thousand, eight hundred eight".