20763980 has 12 divisors (see below), whose sum is σ = 43604400. Its totient is φ = 8305584.

The previous prime is 20763937. The next prime is 20763983. The reversal of 20763980 is 8936702.

It is a super-2 number, since 2×20763980² = 862285730880800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20763980.

It is not an unprimeable number, because it can be changed into a prime (20763983) 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 3 ways as a sum of consecutive naturals, for example, 519080 + ... + 519119.

It is an arithmetic number, because the mean of its divisors is an integer number (3633700).

Almost surely, 2^20763980 is an apocalyptic number.

20763980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20763980 is an abundant number, since it is smaller than the sum of its proper divisors (22840420).

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

20763980 is a wasteful number, since it uses less digits than its factorization.

20763980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1038208 (or 1038206 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 20763980 is about 4556.7510355515. The cubic root of 20763980 is about 274.8549317514.

The spelling of 20763980 in words is "twenty million, seven hundred sixty-three thousand, nine hundred eighty".