20871708 has 48 divisors (see below), whose sum is σ = 57219456. Its totient is φ = 5837760.

The previous prime is 20871707. The next prime is 20871731. The reversal of 20871708 is 80717802.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20871707) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4366 + ... + 7797.

It is an arithmetic number, because the mean of its divisors is an integer number (1192072).

Almost surely, 2^20871708 is an apocalyptic number.

It is an amenable number.

20871708 is an abundant number, since it is smaller than the sum of its proper divisors (36347748).

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

20871708 is a wasteful number, since it uses less digits than its factorization.

20871708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12194 (or 12192 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 33.

The square root of 20871708 is about 4568.5564459685. The cubic root of 20871708 is about 275.3294475913.

The spelling of 20871708 in words is "twenty million, eight hundred seventy-one thousand, seven hundred eight".