20621763 has 16 divisors (see below), whose sum is σ = 30713760. Its totient is φ = 13674528.

The previous prime is 20621759. The next prime is 20621771. The reversal of 20621763 is 36712602.

It is a happy number.

It is not a de Polignac number, because 20621763 - 2² = 20621759 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (20621063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3381 + ... + 7257.

It is an arithmetic number, because the mean of its divisors is an integer number (1919610).

Almost surely, 2^20621763 is an apocalyptic number.

20621763 is a deficient number, since it is larger than the sum of its proper divisors (10091997).

20621763 is a wasteful number, since it uses less digits than its factorization.

20621763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4083 (or 4077 counting only the distinct ones).

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

The square root of 20621763 is about 4541.1191351912. The cubic root of 20621763 is about 274.2259799467.

The spelling of 20621763 in words is "twenty million, six hundred twenty-one thousand, seven hundred sixty-three".