20961263 has 2 divisors, whose sum is σ = 20961264. Its totient is φ = 20961262.

The previous prime is 20961251. The next prime is 20961299. The reversal of 20961263 is 36216902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20961263 - 2¹⁴ = 20944879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20961163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10480631 + 10480632.

It is an arithmetic number, because the mean of its divisors is an integer number (10480632).

Almost surely, 2^20961263 is an apocalyptic number.

20961263 is a deficient number, since it is larger than the sum of its proper divisors (1).

20961263 is an equidigital number, since it uses as much as digits as its factorization.

20961263 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 20961263 is about 4578.3471908539. The cubic root of 20961263 is about 275.7226744219.

The spelling of 20961263 in words is "twenty million, nine hundred sixty-one thousand, two hundred sixty-three".