19720902 has 16 divisors (see below), whose sum is σ = 39704832. Its totient is φ = 6529800.

The previous prime is 19720891. The next prime is 19720931. The reversal of 19720902 is 20902791.

It is a self number, because there is not a number n which added to its sum of digits gives 19720902.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9978 + ... + 11789.

It is an arithmetic number, because the mean of its divisors is an integer number (2481552).

Almost surely, 2^19720902 is an apocalyptic number.

19720902 is an abundant number, since it is smaller than the sum of its proper divisors (19983930).

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

19720902 is a wasteful number, since it uses less digits than its factorization.

19720902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21923.

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 19720902 is about 4440.8222211658. The cubic root of 19720902 is about 270.1731947768.

The spelling of 19720902 in words is "nineteen million, seven hundred twenty thousand, nine hundred two".