20945369 has 2 divisors, whose sum is σ = 20945370. Its totient is φ = 20945368.

The previous prime is 20945363. The next prime is 20945399. The reversal of 20945369 is 96354902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19536400 + 1408969 = 4420^2 + 1187^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20945369 is a prime.

It is a super-2 number, since 2×20945369² = 877416965092322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20945363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10472684 + 10472685.

It is an arithmetic number, because the mean of its divisors is an integer number (10472685).

Almost surely, 2^20945369 is an apocalyptic number.

It is an amenable number.

20945369 is a deficient number, since it is larger than the sum of its proper divisors (1).

20945369 is an equidigital number, since it uses as much as digits as its factorization.

20945369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 20945369 is about 4576.6110824495. The cubic root of 20945369 is about 275.6529673580.

The spelling of 20945369 in words is "twenty million, nine hundred forty-five thousand, three hundred sixty-nine".