20875637 has 2 divisors, whose sum is σ = 20875638. Its totient is φ = 20875636.

The previous prime is 20875627. The next prime is 20875667. The reversal of 20875637 is 73657802.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20421361 + 454276 = 4519^2 + 674^2 .

It is a cyclic number.

It is not a de Polignac number, because 20875637 - 2⁸ = 20875381 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20875637.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20875607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10437818 + 10437819.

It is an arithmetic number, because the mean of its divisors is an integer number (10437819).

Almost surely, 2^20875637 is an apocalyptic number.

It is an amenable number.

20875637 is a deficient number, since it is larger than the sum of its proper divisors (1).

20875637 is an equidigital number, since it uses as much as digits as its factorization.

20875637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 20875637 is about 4568.9864302709. The cubic root of 20875637 is about 275.3467229947.

It can be divided in two parts, 20875 and 637, that added together give a palindrome (21512).

The spelling of 20875637 in words is "twenty million, eight hundred seventy-five thousand, six hundred thirty-seven".