20861037 has 8 divisors (see below), whose sum is σ = 30905280. Its totient is φ = 13907340.

The previous prime is 20861033. The next prime is 20861051. The reversal of 20861037 is 73016802.

It is not a de Polignac number, because 20861037 - 2² = 20861033 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 772631 = 20861037 / (2 + 0 + 8 + 6 + 1 + 0 + 3 + 7).

It is a self number, because there is not a number n which added to its sum of digits gives 20861037.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20861033) 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 7 ways as a sum of consecutive naturals, for example, 386289 + ... + 386342.

It is an arithmetic number, because the mean of its divisors is an integer number (3863160).

Almost surely, 2^20861037 is an apocalyptic number.

20861037 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20861037 is a deficient number, since it is larger than the sum of its proper divisors (10044243).

20861037 is an equidigital number, since it uses as much as digits as its factorization.

20861037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772640 (or 772634 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 20861037 is about 4567.3884222825. The cubic root of 20861037 is about 275.2825173739.

Adding to 20861037 its reverse (73016802), we get a palindrome (93877839).

The spelling of 20861037 in words is "twenty million, eight hundred sixty-one thousand, thirty-seven".