19797156 has 24 divisors (see below), whose sum is σ = 51326240. Its totient is φ = 6599016.

The previous prime is 19797149. The next prime is 19797161. The reversal of 19797156 is 65179791.

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, 91546 + ... + 91761.

Almost surely, 2^19797156 is an apocalyptic number.

It is an amenable number.

19797156 is an abundant number, since it is smaller than the sum of its proper divisors (31529084).

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

19797156 is a wasteful number, since it uses less digits than its factorization.

19797156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183320 (or 183312 counting only the distinct ones).

The product of its digits is 119070, while the sum is 45.

The square root of 19797156 is about 4449.3995100463. The cubic root of 19797156 is about 270.5209694430.

The spelling of 19797156 in words is "nineteen million, seven hundred ninety-seven thousand, one hundred fifty-six".