20763621 has 12 divisors (see below), whose sum is σ = 31103072. Its totient is φ = 13842252.

The previous prime is 20763601. The next prime is 20763661. The reversal of 20763621 is 12636702.

It is a happy number.

20763621 is a `hidden beast` number, since 2 + 0 + 7 + 636 + 21 = 666.

It is not a de Polignac number, because 20763621 - 2⁷ = 20763493 is a prime.

It is a super-2 number, since 2×20763621² = 862255914063282, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20763601) 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, 42481 + ... + 42966.

Almost surely, 2^20763621 is an apocalyptic number.

It is an amenable number.

20763621 is a deficient number, since it is larger than the sum of its proper divisors (10339451).

20763621 is an frugal number, since it uses more digits than its factorization.

20763621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85462 (or 85450 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 20763621 is about 4556.7116432796. The cubic root of 20763621 is about 274.8533477023.

The spelling of 20763621 in words is "twenty million, seven hundred sixty-three thousand, six hundred twenty-one".