20612727765 has 48 divisors (see below), whose sum is σ = 42608187648. Its totient is φ = 9013264128.

The previous prime is 20612727721. The next prime is 20612727827. The reversal of 20612727765 is 56772721602.

20612727765 is a `hidden beast` number, since 2 + 0 + 612 + 7 + 27 + 7 + 6 + 5 = 666.

It is not a de Polignac number, because 20612727765 - 2¹¹ = 20612725717 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 20612727765.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1415304 + ... + 1429793.

It is an arithmetic number, because the mean of its divisors is an integer number (887670576).

Almost surely, 2^20612727765 is an apocalyptic number.

It is an amenable number.

20612727765 is an abundant number, since it is smaller than the sum of its proper divisors (21995459883).

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

20612727765 is a wasteful number, since it uses less digits than its factorization.

20612727765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2845138 (or 2845135 counting only the distinct ones).

The product of its (nonzero) digits is 493920, while the sum is 45.

The spelling of 20612727765 in words is "twenty billion, six hundred twelve million, seven hundred twenty-seven thousand, seven hundred sixty-five".