20266720615 has 32 divisors (see below), whose sum is σ = 25695558720. Its totient is φ = 15321686016.

The previous prime is 20266720613. The next prime is 20266720667. The reversal of 20266720615 is 51602766202.

It is a cyclic number.

It is not a de Polignac number, because 20266720615 - 2¹ = 20266720613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20266720613) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3401479 + ... + 3407431.

It is an arithmetic number, because the mean of its divisors is an integer number (802986210).

Almost surely, 2^20266720615 is an apocalyptic number.

20266720615 is a deficient number, since it is larger than the sum of its proper divisors (5428838105).

20266720615 is a wasteful number, since it uses less digits than its factorization.

20266720615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6483.

The product of its (nonzero) digits is 60480, while the sum is 37.

The spelling of 20266720615 in words is "twenty billion, two hundred sixty-six million, seven hundred twenty thousand, six hundred fifteen".