20149469 has 2 divisors, whose sum is σ = 20149470. Its totient is φ = 20149468.

The previous prime is 20149457. The next prime is 20149477. The reversal of 20149469 is 96494102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14341369 + 5808100 = 3787^2 + 2410^2 .

It is a cyclic number.

It is not a de Polignac number, because 20149469 - 2⁴ = 20149453 is a prime.

It is a super-2 number, since 2×20149469² = 812002201963922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20149489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10074734 + 10074735.

It is an arithmetic number, because the mean of its divisors is an integer number (10074735).

Almost surely, 2^20149469 is an apocalyptic number.

It is an amenable number.

20149469 is a deficient number, since it is larger than the sum of its proper divisors (1).

20149469 is an equidigital number, since it uses as much as digits as its factorization.

20149469 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 20149469 is about 4488.8159908822. The cubic root of 20149469 is about 272.1162862424.

The spelling of 20149469 in words is "twenty million, one hundred forty-nine thousand, four hundred sixty-nine".