20999035972 has 12 divisors (see below), whose sum is σ = 38346065856. Its totient is φ = 10043017160.

The previous prime is 20999035943. The next prime is 20999035973. The reversal of 20999035972 is 27953099902.

It is not an unprimeable number, because it can be changed into a prime (20999035973) by changing a digit.

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, 114125104 + ... + 114125287.

It is an arithmetic number, because the mean of its divisors is an integer number (3195505488).

Almost surely, 2^20999035972 is an apocalyptic number.

It is an amenable number.

20999035972 is a deficient number, since it is larger than the sum of its proper divisors (17347029884).

20999035972 is a wasteful number, since it uses less digits than its factorization.

20999035972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228250418 (or 228250416 counting only the distinct ones).

The product of its (nonzero) digits is 2755620, while the sum is 55.

The spelling of 20999035972 in words is "twenty billion, nine hundred ninety-nine million, thirty-five thousand, nine hundred seventy-two".