20903291 has 2 divisors, whose sum is σ = 20903292. Its totient is φ = 20903290.

The previous prime is 20903279. The next prime is 20903299. The reversal of 20903291 is 19230902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20903291 - 2⁶ = 20903227 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 20903291.

It is not a weakly prime, because it can be changed into another prime (20903299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10451645 + 10451646.

It is an arithmetic number, because the mean of its divisors is an integer number (10451646).

Almost surely, 2^20903291 is an apocalyptic number.

20903291 is a deficient number, since it is larger than the sum of its proper divisors (1).

20903291 is an equidigital number, since it uses as much as digits as its factorization.

20903291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 20903291 is about 4572.0117016473. The cubic root of 20903291 is about 275.4682534733.

The spelling of 20903291 in words is "twenty million, nine hundred three thousand, two hundred ninety-one".