20635296864 has 768 divisors, whose sum is σ = 76082872320. Its totient is φ = 4737761280.

The previous prime is 20635296863. The next prime is 20635296887. The reversal of 20635296864 is 46869253602.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20635296863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 200342637 + ... + 200342739.

It is an arithmetic number, because the mean of its divisors is an integer number (99066240).

Almost surely, 2^20635296864 is an apocalyptic number.

20635296864 is a gapful number since it is divisible by the number (24) 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 20635296864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38041436160).

20635296864 is an abundant number, since it is smaller than the sum of its proper divisors (55447575456).

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

20635296864 is a wasteful number, since it uses less digits than its factorization.

20635296864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243 (or 235 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 51.

The spelling of 20635296864 in words is "twenty billion, six hundred thirty-five million, two hundred ninety-six thousand, eight hundred sixty-four".