20351213100 has 108 divisors (see below), whose sum is σ = 64120810936. Its totient is φ = 5398824960.

The previous prime is 20351213087. The next prime is 20351213107. The reversal of 20351213100 is 131215302.

20351213100 is a `hidden beast` number, since 2 + 0 + 351 + 2 + 1 + 310 + 0 = 666.

It is a super-2 number, since 2×20351213100² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20351213107) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 115119 + ... + 232281.

Almost surely, 2^20351213100 is an apocalyptic number.

20351213100 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 20351213100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32060405468).

20351213100 is an abundant number, since it is smaller than the sum of its proper divisors (43769597836).

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

20351213100 is a wasteful number, since it uses less digits than its factorization.

20351213100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117376 (or 117366 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

Adding to 20351213100 its reverse (131215302), we get a palindrome (20482428402).

It can be divided in two parts, 203512 and 13100, that added together give a palindrome (216612).

The spelling of 20351213100 in words is "twenty billion, three hundred fifty-one million, two hundred thirteen thousand, one hundred".