20311211020 has 12 divisors (see below), whose sum is σ = 42653543184. Its totient is φ = 8124484400.

The previous prime is 20311211017. The next prime is 20311211027. The reversal of 20311211020 is 2011211302.

It is not an unprimeable number, because it can be changed into a prime (20311211027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 507780256 + ... + 507780295.

It is an arithmetic number, because the mean of its divisors is an integer number (3554461932).

Almost surely, 2^20311211020 is an apocalyptic number.

20311211020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20311211020 is an abundant number, since it is smaller than the sum of its proper divisors (22342332164).

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

20311211020 is a wasteful number, since it uses less digits than its factorization.

20311211020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015560560 (or 1015560558 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 20311211020 its reverse (2011211302), we get a palindrome (22322422322).

The spelling of 20311211020 in words is "twenty billion, three hundred eleven million, two hundred eleven thousand, twenty".