20734240464 has 80 divisors (see below), whose sum is σ = 68017095040. Its totient is φ = 5924067840.

The previous prime is 20734240393. The next prime is 20734240481. The reversal of 20734240464 is 46404243702.

20734240464 is a `hidden beast` number, since 207 + 3 + 42 + 404 + 6 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3425257 + ... + 3431304.

It is an arithmetic number, because the mean of its divisors is an integer number (850213688).

Almost surely, 2^20734240464 is an apocalyptic number.

20734240464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20734240464 is an abundant number, since it is smaller than the sum of its proper divisors (47282854576).

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

20734240464 is a wasteful number, since it uses less digits than its factorization.

20734240464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6856585 (or 6856573 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 36.

The spelling of 20734240464 in words is "twenty billion, seven hundred thirty-four million, two hundred forty thousand, four hundred sixty-four".