19672491820 has 24 divisors (see below), whose sum is σ = 41431302864. Its totient is φ = 7846316736.

The previous prime is 19672491809. The next prime is 19672491899. The reversal of 19672491820 is 2819427691.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1410387 + ... + 1424266.

It is an arithmetic number, because the mean of its divisors is an integer number (1726304286).

Almost surely, 2^19672491820 is an apocalyptic number.

19672491820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19672491820 is an abundant number, since it is smaller than the sum of its proper divisors (21758811044).

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

19672491820 is a wasteful number, since it uses less digits than its factorization.

19672491820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2835009 (or 2835007 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 49.

The spelling of 19672491820 in words is "nineteen billion, six hundred seventy-two million, four hundred ninety-one thousand, eight hundred twenty".