20802870 has 48 divisors (see below), whose sum is σ = 59007312. Its totient is φ = 5042880.

The previous prime is 20802857. The next prime is 20802907. The reversal of 20802870 is 7820802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9517 + ... + 11496.

It is an arithmetic number, because the mean of its divisors is an integer number (1229319).

Almost surely, 2^20802870 is an apocalyptic number.

20802870 is an abundant number, since it is smaller than the sum of its proper divisors (38204442).

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

20802870 is a wasteful number, since it uses less digits than its factorization.

20802870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21037 (or 21034 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 20802870 is about 4561.0163341080. The cubic root of 20802870 is about 275.0264217038.

It can be divided in two parts, 2080 and 2870, that added together give a triangular number (4950 = T₉₉).

The spelling of 20802870 in words is "twenty million, eight hundred two thousand, eight hundred seventy".