20381121736 has 64 divisors (see below), whose sum is σ = 40167763200. Its totient is φ = 9683546112.

The previous prime is 20381121727. The next prime is 20381121781. The reversal of 20381121736 is 63712118302.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8025955 + ... + 8028493.

It is an arithmetic number, because the mean of its divisors is an integer number (627621300).

Almost surely, 2^20381121736 is an apocalyptic number.

It is an amenable number.

20381121736 is a deficient number, since it is larger than the sum of its proper divisors (19786641464).

20381121736 is a wasteful number, since it uses less digits than its factorization.

20381121736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3206 (or 3202 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The spelling of 20381121736 in words is "twenty billion, three hundred eighty-one million, one hundred twenty-one thousand, seven hundred thirty-six".