20155080840 has 32 divisors (see below), whose sum is σ = 60465242880. Its totient is φ = 5374688192.

The previous prime is 20155080839. The next prime is 20155080857. The reversal of 20155080840 is 4808055102.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83979384 + ... + 83979623.

It is an arithmetic number, because the mean of its divisors is an integer number (1889538840).

Almost surely, 2^20155080840 is an apocalyptic number.

20155080840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20155080840 is an abundant number, since it is smaller than the sum of its proper divisors (40310162040).

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

20155080840 is a wasteful number, since it uses less digits than its factorization.

20155080840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167959021 (or 167959017 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 33.

The spelling of 20155080840 in words is "twenty billion, one hundred fifty-five million, eighty thousand, eight hundred forty".