20883613 has 4 divisors (see below), whose sum is σ = 20906748. Its totient is φ = 20860480.

The previous prime is 20883539. The next prime is 20883617. The reversal of 20883613 is 31638802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16990884 + 3892729 = 4122^2 + 1973^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20883613 is a prime.

It is a super-2 number, since 2×20883613² = 872250583867538, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20883617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10156 + ... + 12037.

It is an arithmetic number, because the mean of its divisors is an integer number (5226687).

Almost surely, 2^20883613 is an apocalyptic number.

It is an amenable number.

20883613 is a deficient number, since it is larger than the sum of its proper divisors (23135).

20883613 is an equidigital number, since it uses as much as digits as its factorization.

20883613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23134.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 20883613 is about 4569.8591882026. The cubic root of 20883613 is about 275.3817859699.

It can be divided in two parts, 208836 and 13, that added together give a square (208849 = 457²).

The spelling of 20883613 in words is "twenty million, eight hundred eighty-three thousand, six hundred thirteen".