20763684 has 18 divisors (see below), whose sum is σ = 52486070. Its totient is φ = 6921216.

The previous prime is 20763679. The next prime is 20763689. The reversal of 20763684 is 48636702.

It is an interprime number because it is at equal distance from previous prime (20763679) and next prime (20763689).

It can be written as a sum of positive squares in only one way, i.e., 11289600 + 9474084 = 3360^2 + 3078^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×20763684² = 862261146503712, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 576769 = 20763684 / (2 + 0 + 7 + 6 + 3 + 6 + 8 + 4).

It is not an unprimeable number, because it can be changed into a prime (20763689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 288349 + ... + 288420.

Almost surely, 2^20763684 is an apocalyptic number.

It is an amenable number.

20763684 is an abundant number, since it is smaller than the sum of its proper divisors (31722386).

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

20763684 is a wasteful number, since it uses less digits than its factorization.

20763684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576779 (or 576774 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 20763684 is about 4556.7185561542. The cubic root of 20763684 is about 274.8536256844.

The spelling of 20763684 in words is "twenty million, seven hundred sixty-three thousand, six hundred eighty-four".