20403402100 has 36 divisors (see below), whose sum is σ = 45472022764. Its totient is φ = 7940782080.

The previous prime is 20403402083. The next prime is 20403402109. The reversal of 20403402100 is 120430402.

It can be written as a sum of positive squares in 6 ways, for example, as 35545444 + 20367856656 = 5962^2 + 142716^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20403402109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2753517 + ... + 2760916.

Almost surely, 2^20403402100 is an apocalyptic number.

20403402100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20403402100 is an abundant number, since it is smaller than the sum of its proper divisors (25068620664).

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

20403402100 is a wasteful number, since it uses less digits than its factorization.

20403402100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5514484 (or 5514477 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 20403402100 its reverse (120430402), we get a palindrome (20523832502).

The spelling of 20403402100 in words is "twenty billion, four hundred three million, four hundred two thousand, one hundred".