20705020002 has 24 divisors (see below), whose sum is σ = 44885855820. Its totient is φ = 6897830400.

The previous prime is 20705019989. The next prime is 20705020013. The reversal of 20705020002 is 20002050702.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20698864641 + 6155361 = 143871^2 + 2481^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 286927 + ... + 351762.

Almost surely, 2^20705020002 is an apocalyptic number.

20705020002 is an abundant number, since it is smaller than the sum of its proper divisors (24180835818).

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

20705020002 is a wasteful number, since it uses less digits than its factorization.

20705020002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640498 (or 640495 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 18.

Adding to 20705020002 its reverse (20002050702), we get a palindrome (40707070704).

The spelling of 20705020002 in words is "twenty billion, seven hundred five million, twenty thousand, two".