20902470 has 32 divisors (see below), whose sum is σ = 52807680. Its totient is φ = 5280480.

The previous prime is 20902457. The next prime is 20902493. The reversal of 20902470 is 7420902.

It is a self number, because there is not a number n which added to its sum of digits gives 20902470.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17766 + ... + 18905.

It is an arithmetic number, because the mean of its divisors is an integer number (1650240).

Almost surely, 2^20902470 is an apocalyptic number.

20902470 is an abundant number, since it is smaller than the sum of its proper divisors (31905210).

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

20902470 is a wasteful number, since it uses less digits than its factorization.

20902470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36700.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 20902470 is about 4571.9219153437. The cubic root of 20902470 is about 275.4646469854.

It can be divided in two parts, 2090 and 2470, that added together give a triangular number (4560 = T₉₅).

The spelling of 20902470 in words is "twenty million, nine hundred two thousand, four hundred seventy".