20402202402 has 20 divisors (see below), whose sum is σ = 45716046486. Its totient is φ = 6800734080.

The previous prime is 20402202397. The next prime is 20402202461. The reversal of 20402202402 is 20420220402.

20402202402 is a `hidden beast` number, since 2 + 0 + 40 + 220 + 2 + 402 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16938762201 + 3463440201 = 130149^2 + 58851^2 .

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 9 ways as a sum of consecutive naturals, for example, 62969599 + ... + 62969922.

Almost surely, 2^20402202402 is an apocalyptic number.

20402202402 is an abundant number, since it is smaller than the sum of its proper divisors (25313844084).

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

20402202402 is a wasteful number, since it uses less digits than its factorization.

20402202402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125939535 (or 125939526 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

Adding to 20402202402 its reverse (20420220402), we get a palindrome (40822422804).

The spelling of 20402202402 in words is "twenty billion, four hundred two million, two hundred two thousand, four hundred two".