20091790264 has 128 divisors (see below), whose sum is σ = 47456640000. Its totient is φ = 7924113792.

The previous prime is 20091790249. The next prime is 20091790333. The reversal of 20091790264 is 46209719002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15659367 + ... + 15660649.

It is an arithmetic number, because the mean of its divisors is an integer number (370755000).

Almost surely, 2^20091790264 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20091790264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23728320000).

20091790264 is an abundant number, since it is smaller than the sum of its proper divisors (27364849736).

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

20091790264 is a wasteful number, since it uses less digits than its factorization.

20091790264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1762 (or 1744 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 40.

The spelling of 20091790264 in words is "twenty billion, ninety-one million, seven hundred ninety thousand, two hundred sixty-four".