20763990 has 48 divisors (see below), whose sum is σ = 58142448. Its totient is φ = 5110848.

The previous prime is 20763983. The next prime is 20763991. The reversal of 20763990 is 9936702.

It is a super-2 number, since 2×20763990² = 862286561440200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20763991) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7704 + ... + 10043.

It is an arithmetic number, because the mean of its divisors is an integer number (1211301).

Almost surely, 2^20763990 is an apocalyptic number.

20763990 is an abundant number, since it is smaller than the sum of its proper divisors (37378458).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20763990 is a wasteful number, since it uses less digits than its factorization.

20763990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17773 (or 17770 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 36.

The square root of 20763990 is about 4556.7521328244. The cubic root of 20763990 is about 274.8549758751.

The spelling of 20763990 in words is "twenty million, seven hundred sixty-three thousand, nine hundred ninety".