20320155400 has 48 divisors (see below), whose sum is σ = 47278224000. Its totient is φ = 8122236480.

The previous prime is 20320155371. The next prime is 20320155413. The reversal of 20320155400 is 455102302.

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, 248901 + ... + 320299.

It is an arithmetic number, because the mean of its divisors is an integer number (984963000).

Almost surely, 2^20320155400 is an apocalyptic number.

20320155400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20320155400 is an abundant number, since it is smaller than the sum of its proper divisors (26958068600).

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

20320155400 is a wasteful number, since it uses less digits than its factorization.

20320155400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72838 (or 72829 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

Adding to 20320155400 its reverse (455102302), we get a palindrome (20775257702).

The spelling of 20320155400 in words is "twenty billion, three hundred twenty million, one hundred fifty-five thousand, four hundred".