20790902655 has 24 divisors (see below), whose sum is σ = 36046312848. Its totient is φ = 11085789696.

The previous prime is 20790902651. The next prime is 20790902659. The reversal of 20790902655 is 55620909702.

It is an interprime number because it is at equal distance from previous prime (20790902651) and next prime (20790902659).

It is not a de Polignac number, because 20790902655 - 2² = 20790902651 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 20790902655.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20790902651) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 138799 + ... + 246671.

It is an arithmetic number, because the mean of its divisors is an integer number (1501929702).

Almost surely, 2^20790902655 is an apocalyptic number.

20790902655 is a deficient number, since it is larger than the sum of its proper divisors (15255410193).

20790902655 is a wasteful number, since it uses less digits than its factorization.

20790902655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112167 (or 112164 counting only the distinct ones).

The product of its (nonzero) digits is 340200, while the sum is 45.

The spelling of 20790902655 in words is "twenty billion, seven hundred ninety million, nine hundred two thousand, six hundred fifty-five".