20638914720772 has 12 divisors (see below), whose sum is σ = 36177020995276. Its totient is φ = 10302623007840.

The previous prime is 20638914720763. The next prime is 20638914720839. The reversal of 20638914720772 is 27702741983602.

It can be written as a sum of positive squares in 2 ways, for example, as 5420068234816 + 15218846485956 = 2328104^2 + 3901134^2 .

It is a hoax number, since the sum of its digits (58) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4208585379 + ... + 4208590282.

Almost surely, 2^{20638914720772} is an apocalyptic number.

It is an amenable number.

20638914720772 is a deficient number, since it is larger than the sum of its proper divisors (15538106274504).

20638914720772 is a wasteful number, since it uses less digits than its factorization.

20638914720772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8417176278 (or 8417176276 counting only the distinct ones).

The product of its (nonzero) digits is 14224896, while the sum is 58.

The spelling of 20638914720772 in words is "twenty trillion, six hundred thirty-eight billion, nine hundred fourteen million, seven hundred twenty thousand, seven hundred seventy-two".