20715408 has 60 divisors (see below), whose sum is σ = 66259648. Its totient is φ = 5918400.

The previous prime is 20715407. The next prime is 20715413. The reversal of 20715408 is 80451702.

It is not an unprimeable number, because it can be changed into a prime (20715407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9268 + ... + 11283.

Almost surely, 2^20715408 is an apocalyptic number.

20715408 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20715408 is an abundant number, since it is smaller than the sum of its proper divisors (45544240).

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

20715408 is a wasteful number, since it uses less digits than its factorization.

20715408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20572 (or 20563 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 20715408 is about 4551.4182405048. The cubic root of 20715408 is about 274.6404469059.

The spelling of 20715408 in words is "twenty million, seven hundred fifteen thousand, four hundred eight".