20311100020 has 12 divisors (see below), whose sum is σ = 42653310084. Its totient is φ = 8124440000.

The previous prime is 20311099973. The next prime is 20311100021. The reversal of 20311100020 is 2000111302.

It can be written as a sum of positive squares in 2 ways, for example, as 7070455396 + 13240644624 = 84086^2 + 115068^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20311100021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 507777481 + ... + 507777520.

It is an arithmetic number, because the mean of its divisors is an integer number (3554442507).

Almost surely, 2^20311100020 is an apocalyptic number.

20311100020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20311100020 is an abundant number, since it is smaller than the sum of its proper divisors (22342210064).

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

20311100020 is a wasteful number, since it uses less digits than its factorization.

20311100020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1015555010 (or 1015555008 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 20311100020 its reverse (2000111302), we get a palindrome (22311211322).

The spelling of 20311100020 in words is "twenty billion, three hundred eleven million, one hundred thousand, twenty".