20311133120 has 56 divisors (see below), whose sum is σ = 48495837984. Its totient is φ = 8102624256.

The previous prime is 20311133107. The next prime is 20311133149. The reversal of 20311133120 is 2133111302.

It is a congruent number.

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, 34277 + ... + 204443.

Almost surely, 2^20311133120 is an apocalyptic number.

20311133120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20311133120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24247918992).

20311133120 is an abundant number, since it is smaller than the sum of its proper divisors (28184704864).

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

20311133120 is a wasteful number, since it uses less digits than its factorization.

20311133120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170557 (or 170547 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 20311133120 its reverse (2133111302), we get a palindrome (22444244422).

The spelling of 20311133120 in words is "twenty billion, three hundred eleven million, one hundred thirty-three thousand, one hundred twenty".