20404469 has 2 divisors, whose sum is σ = 20404470. Its totient is φ = 20404468.

The previous prime is 20404453. The next prime is 20404481. The reversal of 20404469 is 96440402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14938225 + 5466244 = 3865^2 + 2338^2 .

It is a cyclic number.

It is not a de Polignac number, because 20404469 - 2⁴ = 20404453 is a prime.

It is a super-2 number, since 2×20404469² = 832684710343922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20400469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10202234 + 10202235.

It is an arithmetic number, because the mean of its divisors is an integer number (10202235).

Almost surely, 2^20404469 is an apocalyptic number.

It is an amenable number.

20404469 is a deficient number, since it is larger than the sum of its proper divisors (1).

20404469 is an equidigital number, since it uses as much as digits as its factorization.

20404469 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 20404469 is about 4517.1306157781. The cubic root of 20404469 is about 273.2593928824.

The spelling of 20404469 in words is "twenty million, four hundred four thousand, four hundred sixty-nine".