20001222100 has 72 divisors (see below), whose sum is σ = 46749681440. Its totient is φ = 7403114880.

The previous prime is 20001222091. The next prime is 20001222113. The reversal of 20001222100 is 122210002.

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

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, 40707 + ... + 204106.

Almost surely, 2^20001222100 is an apocalyptic number.

20001222100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20001222100 is an abundant number, since it is smaller than the sum of its proper divisors (26748459340).

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

20001222100 is a wasteful number, since it uses less digits than its factorization.

20001222100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244889 (or 244882 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 20001222100 its reverse (122210002), we get a palindrome (20123432102).

The spelling of 20001222100 in words is "twenty billion, one million, two hundred twenty-two thousand, one hundred".