20100123220 has 24 divisors (see below), whose sum is σ = 42213878784. Its totient is φ = 8039359776.

The previous prime is 20100123193. The next prime is 20100123257. The reversal of 20100123220 is 2232100102.

It is a self number, because there is not a number n which added to its sum of digits gives 20100123220.

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, 241917 + ... + 314203.

It is an arithmetic number, because the mean of its divisors is an integer number (1758911616).

Almost surely, 2^20100123220 is an apocalyptic number.

20100123220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20100123220 is an abundant number, since it is smaller than the sum of its proper divisors (22113755564).

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

20100123220 is a wasteful number, since it uses less digits than its factorization.

20100123220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86199 (or 86197 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 20100123220 its reverse (2232100102), we get a palindrome (22332223322).

The spelling of 20100123220 in words is "twenty billion, one hundred million, one hundred twenty-three thousand, two hundred twenty".