20513003100 has 72 divisors (see below), whose sum is σ = 61931452800. Its totient is φ = 5232300480.

The previous prime is 20513003099. The next prime is 20513003143. The reversal of 20513003100 is 130031502.

It is a happy number.

It is a super-2 number, since 2×20513003100² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20513003100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1479550 + ... + 1493349.

Almost surely, 2^20513003100 is an apocalyptic number.

20513003100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20513003100 is an abundant number, since it is smaller than the sum of its proper divisors (41418449700).

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

20513003100 is a wasteful number, since it uses less digits than its factorization.

20513003100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2972939 (or 2972932 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 15.

Adding to 20513003100 its reverse (130031502), we get a palindrome (20643034602).

The spelling of 20513003100 in words is "twenty billion, five hundred thirteen million, three thousand, one hundred".