20864069720 has 128 divisors (see below), whose sum is σ = 52409851200. Its totient is φ = 7422191616.

The previous prime is 20864069713. The next prime is 20864069777. The reversal of 20864069720 is 2796046802.

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, 8850782 + ... + 8853138.

Almost surely, 2^20864069720 is an apocalyptic number.

20864069720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20864069720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26204925600).

20864069720 is an abundant number, since it is smaller than the sum of its proper divisors (31545781480).

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

20864069720 is a wasteful number, since it uses less digits than its factorization.

20864069720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2997 (or 2993 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 44.

The spelling of 20864069720 in words is "twenty billion, eight hundred sixty-four million, sixty-nine thousand, seven hundred twenty".