19902504881 has 12 divisors (see below), whose sum is σ = 23248776960. Its totient is φ = 16987902120.

The previous prime is 19902504851. The next prime is 19902504887. The reversal of 19902504881 is 18840520991.

It is not a de Polignac number, because 19902504881 - 2¹⁴ = 19902488497 is a prime.

It is a super-2 number, since 2×19902504881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19902504887) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 838025 + ... + 861446.

It is an arithmetic number, because the mean of its divisors is an integer number (1937398080).

Almost surely, 2^19902504881 is an apocalyptic number.

It is an amenable number.

19902504881 is a deficient number, since it is larger than the sum of its proper divisors (3346272079).

19902504881 is a wasteful number, since it uses less digits than its factorization.

19902504881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1699724 (or 1699717 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 47.

The spelling of 19902504881 in words is "nineteen billion, nine hundred two million, five hundred four thousand, eight hundred eighty-one".