20191859904 has 56 divisors (see below), whose sum is σ = 53704101888. Its totient is φ = 6695368960.

The previous prime is 20191859887. The next prime is 20191859929. The reversal of 20191859904 is 40995819102.

It is a super-2 number, since 2×20191859904² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 238632 + ... + 311975.

Almost surely, 2^20191859904 is an apocalyptic number.

20191859904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20191859904 is an abundant number, since it is smaller than the sum of its proper divisors (33512241984).

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

20191859904 is a wasteful number, since it uses less digits than its factorization.

20191859904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550813 (or 550803 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 48.

The spelling of 20191859904 in words is "twenty billion, one hundred ninety-one million, eight hundred fifty-nine thousand, nine hundred four".