20311002220 has 24 divisors (see below), whose sum is σ = 44029012608. Its totient is φ = 7862323200.

The previous prime is 20311002203. The next prime is 20311002233. The reversal of 20311002220 is 2220011302.

It is a super-2 number, since 2×20311002220² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20311002220.

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, 16379221 + ... + 16380460.

It is an arithmetic number, because the mean of its divisors is an integer number (1834542192).

Almost surely, 2^20311002220 is an apocalyptic number.

20311002220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20311002220 is an abundant number, since it is smaller than the sum of its proper divisors (23718010388).

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

20311002220 is a wasteful number, since it uses less digits than its factorization.

20311002220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32759721 (or 32759719 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 20311002220 its reverse (2220011302), we get a palindrome (22531013522).

The spelling of 20311002220 in words is "twenty billion, three hundred eleven million, two thousand, two hundred twenty".