20002122100 has 36 divisors (see below), whose sum is σ = 43489989900. Its totient is φ = 7985109760.

The previous prime is 20002122097. The next prime is 20002122103. The reversal of 20002122100 is 122120002.

It is an interprime number because it is at equal distance from previous prime (20002122097) and next prime (20002122103).

It can be written as a sum of positive squares in 6 ways, for example, as 75411856 + 19926710244 = 8684^2 + 141162^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20002122103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 145585 + ... + 247384.

It is an arithmetic number, because the mean of its divisors is an integer number (1208055275).

Almost surely, 2^20002122100 is an apocalyptic number.

20002122100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20002122100 is an abundant number, since it is smaller than the sum of its proper divisors (23487867800).

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

20002122100 is a wasteful number, since it uses less digits than its factorization.

20002122100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393492 (or 393485 counting only the distinct ones).

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

Adding to 20002122100 its reverse (122120002), we get a palindrome (20124242102).

The spelling of 20002122100 in words is "twenty billion, two million, one hundred twenty-two thousand, one hundred".