20739511008 has 72 divisors (see below), whose sum is σ = 61011732600. Its totient is φ = 6674782464.

The previous prime is 20739511003. The next prime is 20739511021. The reversal of 20739511008 is 80011593702.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20739511003) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1233238 + ... + 1249941.

It is an arithmetic number, because the mean of its divisors is an integer number (847385175).

Almost surely, 2^20739511008 is an apocalyptic number.

It is an amenable number.

20739511008 is an abundant number, since it is smaller than the sum of its proper divisors (40272221592).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20739511008 is a wasteful number, since it uses less digits than its factorization.

20739511008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2483224 (or 2483213 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The spelling of 20739511008 in words is "twenty billion, seven hundred thirty-nine million, five hundred eleven thousand, eight".