20919774761613 has 288 divisors, whose sum is σ = 40783072911360. Its totient is φ = 10079258042880.

The previous prime is 20919774761549. The next prime is 20919774761749. The reversal of 20919774761613 is 31616747791902.

20919774761613 is a `hidden beast` number, since 2 + 0 + 9 + 1 + 9 + 7 + 7 + 4 + 7 + 6 + 1 + 613 = 666.

It is not a de Polignac number, because 20919774761613 - 2⁶ = 20919774761549 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20919774762613) by changing a digit.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 1737083970 + ... + 1737096012.

Almost surely, 2^{20919774761613} is an apocalyptic number.

It is an amenable number.

20919774761613 is a deficient number, since it is larger than the sum of its proper divisors (19863298149747).

20919774761613 is a wasteful number, since it uses less digits than its factorization.

20919774761613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12409 (or 12393 counting only the distinct ones).

The product of its (nonzero) digits is 24004512, while the sum is 63.

The spelling of 20919774761613 in words is "twenty trillion, nine hundred nineteen billion, seven hundred seventy-four million, seven hundred sixty-one thousand, six hundred thirteen".