19811924252 has 24 divisors (see below), whose sum is σ = 34789819680. Its totient is φ = 9872029440.

The previous prime is 19811924233. The next prime is 19811924263. The reversal of 19811924252 is 25242911891.

It is a congruent number.

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, 1639352 + ... + 1651392.

It is an arithmetic number, because the mean of its divisors is an integer number (1449575820).

Almost surely, 2^19811924252 is an apocalyptic number.

It is an amenable number.

19811924252 is a deficient number, since it is larger than the sum of its proper divisors (14977895428).

19811924252 is a wasteful number, since it uses less digits than its factorization.

19811924252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13421 (or 13419 counting only the distinct ones).

The product of its digits is 103680, while the sum is 44.

The spelling of 19811924252 in words is "nineteen billion, eight hundred eleven million, nine hundred twenty-four thousand, two hundred fifty-two".