20011983172 has 24 divisors (see below), whose sum is σ = 36299942784. Its totient is φ = 9646926432.

The previous prime is 20011983163. The next prime is 20011983179. The reversal of 20011983172 is 27138911002.

It is a super-2 number, since 2×20011983172² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20011983179) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 781783 + ... + 806974.

It is an arithmetic number, because the mean of its divisors is an integer number (1512497616).

Almost surely, 2^20011983172 is an apocalyptic number.

It is an amenable number.

20011983172 is a deficient number, since it is larger than the sum of its proper divisors (16287959612).

20011983172 is a wasteful number, since it uses less digits than its factorization.

20011983172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1588875 (or 1588873 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 34.

The spelling of 20011983172 in words is "twenty billion, eleven million, nine hundred eighty-three thousand, one hundred seventy-two".