10001100020 has 24 divisors (see below), whose sum is σ = 21085995168. Its totient is φ = 3984500000.

The previous prime is 10001100019. The next prime is 10001100041. The reversal of 10001100020 is 2000110001.

It is a happy number.

It is a super-2 number, since 2×10001100020² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (5).

It is a junction number, because it is equal to n+sod(n) for n = 10001099977 and 10001100013.

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, 991106 + ... + 1001145.

It is an arithmetic number, because the mean of its divisors is an integer number (878583132).

Almost surely, 2^10001100020 is an apocalyptic number.

10001100020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10001100020 is an abundant number, since it is smaller than the sum of its proper divisors (11084895148).

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

10001100020 is a wasteful number, since it uses less digits than its factorization.

10001100020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1992511 (or 1992509 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 5.

Adding to 10001100020 its reverse (2000110001), we get a palindrome (12001210021).

The spelling of 10001100020 in words is "ten billion, one million, one hundred thousand, twenty".