19597428220 has 12 divisors (see below), whose sum is σ = 41154599304. Its totient is φ = 7838971280.

The previous prime is 19597428209. The next prime is 19597428289. The reversal of 19597428220 is 2282479591.

It is a happy number.

It is a congruent number.

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, 489935686 + ... + 489935725.

It is an arithmetic number, because the mean of its divisors is an integer number (3429549942).

Almost surely, 2^19597428220 is an apocalyptic number.

19597428220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19597428220 is an abundant number, since it is smaller than the sum of its proper divisors (21557171084).

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

19597428220 is a wasteful number, since it uses less digits than its factorization.

19597428220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 979871420 (or 979871418 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 49.

The spelling of 19597428220 in words is "nineteen billion, five hundred ninety-seven million, four hundred twenty-eight thousand, two hundred twenty".