20420902388 has 6 divisors (see below), whose sum is σ = 35736579186. Its totient is φ = 10210451192.

The previous prime is 20420902387. The next prime is 20420902423. The reversal of 20420902388 is 88320902402.

It can be written as a sum of positive squares in only one way, i.e., 20092495504 + 328406884 = 141748^2 + 18122^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20420902387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2552612795 + ... + 2552612802.

It is an arithmetic number, because the mean of its divisors is an integer number (5956096531).

Almost surely, 2^20420902388 is an apocalyptic number.

It is an amenable number.

20420902388 is a deficient number, since it is larger than the sum of its proper divisors (15315676798).

20420902388 is a wasteful number, since it uses less digits than its factorization.

20420902388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5105225601 (or 5105225599 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 38.

The spelling of 20420902388 in words is "twenty billion, four hundred twenty million, nine hundred two thousand, three hundred eighty-eight".