20404222100 has 18 divisors (see below), whose sum is σ = 44277162174. Its totient is φ = 8161688800.

The previous prime is 20404222087. The next prime is 20404222109. The reversal of 20404222100 is 122240402.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 400080004 + 20004142096 = 20002^2 + 141436^2 .

It is a super-2 number, since 2×20404222100² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20404222109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 102021011 + ... + 102021210.

It is an arithmetic number, because the mean of its divisors is an integer number (2459842343).

Almost surely, 2^20404222100 is an apocalyptic number.

20404222100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20404222100 is an abundant number, since it is smaller than the sum of its proper divisors (23872940074).

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

20404222100 is a wasteful number, since it uses less digits than its factorization.

20404222100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204042235 (or 204042228 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

Adding to 20404222100 its reverse (122240402), we get a palindrome (20526462502).

The spelling of 20404222100 in words is "twenty billion, four hundred four million, two hundred twenty-two thousand, one hundred".