20734765215 has 8 divisors (see below), whose sum is σ = 33175624368. Its totient is φ = 11058541440.

The previous prime is 20734765211. The next prime is 20734765217. The reversal of 20734765215 is 51256743702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20734765215 - 2² = 20734765211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20734765211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 691158826 + ... + 691158855.

It is an arithmetic number, because the mean of its divisors is an integer number (4146953046).

Almost surely, 2^20734765215 is an apocalyptic number.

20734765215 is a deficient number, since it is larger than the sum of its proper divisors (12440859153).

20734765215 is a wasteful number, since it uses less digits than its factorization.

20734765215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1382317689.

The product of its (nonzero) digits is 352800, while the sum is 42.

The spelling of 20734765215 in words is "twenty billion, seven hundred thirty-four million, seven hundred sixty-five thousand, two hundred fifteen".