20215544917464 has 256 divisors, whose sum is σ = 60798005654400. Its totient is φ = 6186909081600.

The previous prime is 20215544917441. The next prime is 20215544917483. The reversal of 20215544917464 is 46471944551202.

20215544917464 is a `hidden beast` number, since 2 + 0 + 2 + 1 + 5 + 544 + 91 + 7 + 4 + 6 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 20215544917464.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 428626044 + ... + 428673204.

Almost surely, 2^{20215544917464} is an apocalyptic number.

20215544917464 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 20215544917464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30399002827200).

20215544917464 is an abundant number, since it is smaller than the sum of its proper divisors (40582460736936).

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

20215544917464 is a wasteful number, since it uses less digits than its factorization.

20215544917464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48003 (or 47993 counting only the distinct ones).

The product of its (nonzero) digits is 9676800, while the sum is 54.

The spelling of 20215544917464 in words is "twenty trillion, two hundred fifteen billion, five hundred forty-four million, nine hundred seventeen thousand, four hundred sixty-four".