20685015296 has 72 divisors (see below), whose sum is σ = 45107384448. Its totient is φ = 9388800000.

The previous prime is 20685015287. The next prime is 20685015301. The reversal of 20685015296 is 69251058602.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2109926 + ... + 2119706.

Almost surely, 2^20685015296 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 20685015296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22553692224).

20685015296 is an abundant number, since it is smaller than the sum of its proper divisors (24422369152).

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

20685015296 is an equidigital number, since it uses as much as digits as its factorization.

20685015296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10559 (or 10545 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 44.

The spelling of 20685015296 in words is "twenty billion, six hundred eighty-five million, fifteen thousand, two hundred ninety-six".