20249969 has 2 divisors, whose sum is σ = 20249970. Its totient is φ = 20249968.

The previous prime is 20249963. The next prime is 20250007. The reversal of 20249969 is 96994202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20205025 + 44944 = 4495^2 + 212^2 .

It is a cyclic number.

It is not a de Polignac number, because 20249969 - 2¹⁶ = 20184433 is a prime.

It is a super-2 number, since 2×20249969² = 820122489001922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20249963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10124984 + 10124985.

It is an arithmetic number, because the mean of its divisors is an integer number (10124985).

Almost surely, 2^20249969 is an apocalyptic number.

It is an amenable number.

20249969 is a deficient number, since it is larger than the sum of its proper divisors (1).

20249969 is an equidigital number, since it uses as much as digits as its factorization.

20249969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 20249969 is about 4499.9965555542. The cubic root of 20249969 is about 272.5679498365.

The spelling of 20249969 in words is "twenty million, two hundred forty-nine thousand, nine hundred sixty-nine".