20709137652 has 48 divisors (see below), whose sum is σ = 55659233280. Its totient is φ = 5870303712.

The previous prime is 20709137633. The next prime is 20709137663. The reversal of 20709137652 is 25673190702.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

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, 959952 + ... + 981287.

It is an arithmetic number, because the mean of its divisors is an integer number (1159567360).

Almost surely, 2^20709137652 is an apocalyptic number.

It is an amenable number.

20709137652 is an abundant number, since it is smaller than the sum of its proper divisors (34950095628).

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

20709137652 is a wasteful number, since it uses less digits than its factorization.

20709137652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1941380 (or 1941378 counting only the distinct ones).

The product of its (nonzero) digits is 158760, while the sum is 42.

The spelling of 20709137652 in words is "twenty billion, seven hundred nine million, one hundred thirty-seven thousand, six hundred fifty-two".