20663757 has 12 divisors (see below), whose sum is σ = 30138784. Its totient is φ = 13641480.

The previous prime is 20663737. The next prime is 20663759. The reversal of 20663757 is 75736602.

It is a happy number.

It is not a de Polignac number, because 20663757 - 2¹⁸ = 20401613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20663759) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10219 + ... + 12072.

Almost surely, 2^20663757 is an apocalyptic number.

It is an amenable number.

20663757 is a deficient number, since it is larger than the sum of its proper divisors (9475027).

20663757 is a wasteful number, since it uses less digits than its factorization.

20663757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22400 (or 22397 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 36.

The square root of 20663757 is about 4545.7405337305. The cubic root of 20663757 is about 274.4119976295.

The spelling of 20663757 in words is "twenty million, six hundred sixty-three thousand, seven hundred fifty-seven".