20311801918220 has 96 divisors (see below), whose sum is σ = 44218345264128. Its totient is φ = 7832137370112.

The previous prime is 20311801918193. The next prime is 20311801918249. The reversal of 20311801918220 is 2281910811302.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 622415024 + ... + 622447656.

It is an arithmetic number, because the mean of its divisors is an integer number (460607763168).

Almost surely, 2^{20311801918220} is an apocalyptic number.

20311801918220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20311801918220 is an abundant number, since it is smaller than the sum of its proper divisors (23906543345908).

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

20311801918220 is a wasteful number, since it uses less digits than its factorization.

20311801918220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42639 (or 42637 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 38.

The spelling of 20311801918220 in words is "twenty trillion, three hundred eleven billion, eight hundred one million, nine hundred eighteen thousand, two hundred twenty".