19897023276 has 192 divisors, whose sum is σ = 56757335040. Its totient is φ = 5990906880.

The previous prime is 19897023239. The next prime is 19897023277. The reversal of 19897023276 is 67232079891.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (19897023277) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13167361 + ... + 13168871.

It is an arithmetic number, because the mean of its divisors is an integer number (295611120).

Almost surely, 2^19897023276 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19897023276, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28378667520).

19897023276 is an abundant number, since it is smaller than the sum of its proper divisors (36860311764).

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

19897023276 is a wasteful number, since it uses less digits than its factorization.

19897023276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1733 (or 1725 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 54.

The spelling of 19897023276 in words is "nineteen billion, eight hundred ninety-seven million, twenty-three thousand, two hundred seventy-six".