20004750981 has 32 divisors (see below), whose sum is σ = 30341949440. Its totient is φ = 13019454000.

The previous prime is 20004750979. The next prime is 20004751057. The reversal of 20004750981 is 18905740002.

It is not a de Polignac number, because 20004750981 - 2¹ = 20004750979 is a prime.

It is a super-2 number, since 2×20004750981² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20004750911) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3097806 + ... + 3104256.

It is an arithmetic number, because the mean of its divisors is an integer number (948185920).

Almost surely, 2^20004750981 is an apocalyptic number.

It is an amenable number.

20004750981 is a deficient number, since it is larger than the sum of its proper divisors (10337198459).

20004750981 is a wasteful number, since it uses less digits than its factorization.

20004750981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9174 (or 9168 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The spelling of 20004750981 in words is "twenty billion, four million, seven hundred fifty thousand, nine hundred eighty-one".