19791669220 has 12 divisors (see below), whose sum is σ = 41562505404. Its totient is φ = 7916667680.

The previous prime is 19791669217. The next prime is 19791669307. The reversal of 19791669220 is 2296619791.

It can be written as a sum of positive squares in 2 ways, for example, as 14318036964 + 5473632256 = 119658^2 + 73984^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 494791711 + ... + 494791750.

It is an arithmetic number, because the mean of its divisors is an integer number (3463542117).

Almost surely, 2^19791669220 is an apocalyptic number.

19791669220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19791669220 is an abundant number, since it is smaller than the sum of its proper divisors (21770836184).

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

19791669220 is a wasteful number, since it uses less digits than its factorization.

19791669220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 989583470 (or 989583468 counting only the distinct ones).

The product of its (nonzero) digits is 734832, while the sum is 52.

The spelling of 19791669220 in words is "nineteen billion, seven hundred ninety-one million, six hundred sixty-nine thousand, two hundred twenty".