20912839245 has 12 divisors (see below), whose sum is σ = 36248921436. Its totient is φ = 11153514240.

The previous prime is 20912839229. The next prime is 20912839261. The reversal of 20912839245 is 54293821902.

20912839245 is a `hidden beast` number, since 209 + 12 + 8 + 392 + 45 = 666.

It is an interprime number because it is at equal distance from previous prime (20912839229) and next prime (20912839261).

It can be written as a sum of positive squares in 2 ways, for example, as 11831130441 + 9081708804 = 108771^2 + 95298^2 .

It is not a de Polignac number, because 20912839245 - 2⁴ = 20912839229 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 464729761 = 20912839245 / (2 + 0 + 9 + 1 + 2 + 8 + 3 + 9 + 2 + 4 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 20912839245.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 232364836 + ... + 232364925.

It is an arithmetic number, because the mean of its divisors is an integer number (3020743453).

Almost surely, 2^20912839245 is an apocalyptic number.

It is an amenable number.

20912839245 is a deficient number, since it is larger than the sum of its proper divisors (15336082191).

20912839245 is a wasteful number, since it uses less digits than its factorization.

20912839245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464729772 (or 464729769 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The spelling of 20912839245 in words is "twenty billion, nine hundred twelve million, eight hundred thirty-nine thousand, two hundred forty-five".