20769617915 has 16 divisors (see below), whose sum is σ = 26381894400. Its totient is φ = 15653231712.

The previous prime is 20769617887. The next prime is 20769617923. The reversal of 20769617915 is 51971696702.

It is a cyclic number.

It is not a de Polignac number, because 20769617915 - 2¹⁶ = 20769552379 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 593687 + ... + 627696.

It is an arithmetic number, because the mean of its divisors is an integer number (1648868400).

Almost surely, 2^20769617915 is an apocalyptic number.

20769617915 is a deficient number, since it is larger than the sum of its proper divisors (5612276485).

20769617915 is a wasteful number, since it uses less digits than its factorization.

20769617915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1221586.

The product of its (nonzero) digits is 1428840, while the sum is 53.

The spelling of 20769617915 in words is "twenty billion, seven hundred sixty-nine million, six hundred seventeen thousand, nine hundred fifteen".