20870316 has 36 divisors (see below), whose sum is σ = 54460224. Its totient is φ = 6732000.

The previous prime is 20870293. The next prime is 20870321. The reversal of 20870316 is 61307802.

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20870316.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8235 + ... + 10466.

It is an arithmetic number, because the mean of its divisors is an integer number (1512784).

Almost surely, 2^20870316 is an apocalyptic number.

It is an amenable number.

20870316 is an abundant number, since it is smaller than the sum of its proper divisors (33589908).

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

20870316 is a wasteful number, since it uses less digits than its factorization.

20870316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18742 (or 18737 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 20870316 is about 4568.4040977129. The cubic root of 20870316 is about 275.3233265923.

The spelling of 20870316 in words is "twenty million, eight hundred seventy thousand, three hundred sixteen".