20001687244 has 48 divisors (see below), whose sum is σ = 43801261056. Its totient is φ = 7764076800.

The previous prime is 20001687221. The next prime is 20001687253. The reversal of 20001687244 is 44278610002.

It is a happy 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, 36349 + ... + 203284.

It is an arithmetic number, because the mean of its divisors is an integer number (912526272).

Almost surely, 2^20001687244 is an apocalyptic number.

It is an amenable number.

20001687244 is an abundant number, since it is smaller than the sum of its proper divisors (23799573812).

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

20001687244 is a wasteful number, since it uses less digits than its factorization.

20001687244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239926 (or 239924 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 34.

The spelling of 20001687244 in words is "twenty billion, one million, six hundred eighty-seven thousand, two hundred forty-four".