20951473 has 2 divisors, whose sum is σ = 20951474. Its totient is φ = 20951472.

The previous prime is 20951467. The next prime is 20951477. The reversal of 20951473 is 37415902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12616704 + 8334769 = 3552^2 + 2887^2 .

It is a cyclic number.

It is not a de Polignac number, because 20951473 - 2¹³ = 20943281 is a prime.

It is not a weakly prime, because it can be changed into another prime (20951477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10475736 + 10475737.

It is an arithmetic number, because the mean of its divisors is an integer number (10475737).

Almost surely, 2^20951473 is an apocalyptic number.

It is an amenable number.

20951473 is a deficient number, since it is larger than the sum of its proper divisors (1).

20951473 is an equidigital number, since it uses as much as digits as its factorization.

20951473 is an odious number, because the sum of its binary digits is odd.

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

The square root of 20951473 is about 4577.2779028589. The cubic root of 20951473 is about 275.6797421276.

The spelling of 20951473 in words is "twenty million, nine hundred fifty-one thousand, four hundred seventy-three".