20663357 has 16 divisors (see below), whose sum is σ = 24420480. Its totient is φ = 17236800.

The previous prime is 20663351. The next prime is 20663359. The reversal of 20663357 is 75336602.

It is a cyclic number.

It is not a de Polignac number, because 20663357 - 2¹⁰ = 20662333 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 (20663351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32432 + ... + 33062.

It is an arithmetic number, because the mean of its divisors is an integer number (1526280).

Almost surely, 2^20663357 is an apocalyptic number.

It is an amenable number.

20663357 is a deficient number, since it is larger than the sum of its proper divisors (3757123).

20663357 is a wasteful number, since it uses less digits than its factorization.

20663357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 884.

The product of its (nonzero) digits is 22680, while the sum is 32.

The square root of 20663357 is about 4545.6965362857. The cubic root of 20663357 is about 274.4102269688.

Adding to 20663357 its reverse (75336602), we get a palindrome (95999959).

The spelling of 20663357 in words is "twenty million, six hundred sixty-three thousand, three hundred fifty-seven".