20636421120 has 264 divisors, whose sum is σ = 81720890784. Its totient is φ = 4716822528.

The previous prime is 20636421097. The next prime is 20636421137. The reversal of 20636421120 is 2112463602.

20636421120 is a `hidden beast` number, since 2 + 0 + 6 + 3 + 642 + 1 + 12 + 0 = 666.

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, 290572 + ... + 354548.

Almost surely, 2^20636421120 is an apocalyptic number.

20636421120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20636421120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40860445392).

20636421120 is an abundant number, since it is smaller than the sum of its proper divisors (61084469664).

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

20636421120 is a wasteful number, since it uses less digits than its factorization.

20636421120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64015 (or 63994 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

Adding to 20636421120 its reverse (2112463602), we get a palindrome (22748884722).

The spelling of 20636421120 in words is "twenty billion, six hundred thirty-six million, four hundred twenty-one thousand, one hundred twenty".