20749198741677 has 96 divisors (see below), whose sum is σ = 35762914197504. Its totient is φ = 11343313094400.

The previous prime is 20749198741669. The next prime is 20749198741679. The reversal of 20749198741677 is 77614789194702.

It is a happy number.

20749198741677 is a `hidden beast` number, since 2 + 0 + 7 + 491 + 9 + 8 + 74 + 1 + 67 + 7 = 666.

It is not a de Polignac number, because 20749198741677 - 2³ = 20749198741669 is a prime.

It is a super-2 number, since 2×20749198741677² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20749198741679) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 69547858 + ... + 69845564.

It is an arithmetic number, because the mean of its divisors is an integer number (372530356224).

Almost surely, 2^{20749198741677} is an apocalyptic number.

It is an amenable number.

20749198741677 is a deficient number, since it is larger than the sum of its proper divisors (15013715455827).

20749198741677 is a wasteful number, since it uses less digits than its factorization.

20749198741677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298159 (or 298156 counting only the distinct ones).

The product of its (nonzero) digits is 298722816, while the sum is 72.

The spelling of 20749198741677 in words is "twenty trillion, seven hundred forty-nine billion, one hundred ninety-eight million, seven hundred forty-one thousand, six hundred seventy-seven".