20942507 has 2 divisors, whose sum is σ = 20942508. Its totient is φ = 20942506.

The previous prime is 20942483. The next prime is 20942527. The reversal of 20942507 is 70524902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20942507 - 2¹⁶ = 20876971 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20942507.

It is not a weakly prime, because it can be changed into another prime (20942527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10471253 + 10471254.

It is an arithmetic number, because the mean of its divisors is an integer number (10471254).

Almost surely, 2^20942507 is an apocalyptic number.

20942507 is a deficient number, since it is larger than the sum of its proper divisors (1).

20942507 is an equidigital number, since it uses as much as digits as its factorization.

20942507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 20942507 is about 4576.2983949913. The cubic root of 20942507 is about 275.6404116036.

The spelling of 20942507 in words is "twenty million, nine hundred forty-two thousand, five hundred seven".