20945537 has 2 divisors, whose sum is σ = 20945538. Its totient is φ = 20945536.

The previous prime is 20945521. The next prime is 20945563. The reversal of 20945537 is 73554902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20421361 + 524176 = 4519^2 + 724^2 .

It is a cyclic number.

It is not a de Polignac number, because 20945537 - 2⁴ = 20945521 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20945497 and 20945506.

It is not a weakly prime, because it can be changed into another prime (20941537) 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 as a sum of consecutive naturals, namely, 10472768 + 10472769.

It is an arithmetic number, because the mean of its divisors is an integer number (10472769).

Almost surely, 2^20945537 is an apocalyptic number.

It is an amenable number.

20945537 is a deficient number, since it is larger than the sum of its proper divisors (1).

20945537 is an equidigital number, since it uses as much as digits as its factorization.

20945537 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37800, while the sum is 35.

The square root of 20945537 is about 4576.6294366051. The cubic root of 20945537 is about 275.6537043479.

The spelling of 20945537 in words is "twenty million, nine hundred forty-five thousand, five hundred thirty-seven".