20111999972 has 12 divisors (see below), whose sum is σ = 35218471680. Its totient is φ = 10049579496.

The previous prime is 20111999969. The next prime is 20111999981. The reversal of 20111999972 is 27999911102.

It is a self number, because there is not a number n which added to its sum of digits gives 20111999972.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1598072 + ... + 1610607.

It is an arithmetic number, because the mean of its divisors is an integer number (2934872640).

Almost surely, 2^20111999972 is an apocalyptic number.

It is an amenable number.

20111999972 is a deficient number, since it is larger than the sum of its proper divisors (15106471708).

20111999972 is a wasteful number, since it uses less digits than its factorization.

20111999972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3210250 (or 3210248 counting only the distinct ones).

The product of its (nonzero) digits is 183708, while the sum is 50.

The spelling of 20111999972 in words is "twenty billion, one hundred eleven million, nine hundred ninety-nine thousand, nine hundred seventy-two".