20941537 has 2 divisors, whose sum is σ = 20941538. Its totient is φ = 20941536.

The previous prime is 20941511. The next prime is 20941549. The reversal of 20941537 is 73514902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18352656 + 2588881 = 4284^2 + 1609^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20941537 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20941499 and 20941508.

It is not a weakly prime, because it can be changed into another prime (20941577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10470768 + 10470769.

It is an arithmetic number, because the mean of its divisors is an integer number (10470769).

Almost surely, 2^20941537 is an apocalyptic number.

It is an amenable number.

20941537 is a deficient number, since it is larger than the sum of its proper divisors (1).

20941537 is an equidigital number, since it uses as much as digits as its factorization.

20941537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 20941537 is about 4576.1924129127. The cubic root of 20941537 is about 275.6361558996.

The spelling of 20941537 in words is "twenty million, nine hundred forty-one thousand, five hundred thirty-seven".