20426769 has 16 divisors (see below), whose sum is σ = 33013440. Its totient is φ = 12379680.

The previous prime is 20426761. The next prime is 20426773. The reversal of 20426769 is 96762402.

It is a happy number.

It is not a de Polignac number, because 20426769 - 2³ = 20426761 is a prime.

It is a super-2 number, since 2×20426769² = 834505783558722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20426761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34092 + ... + 34685.

It is an arithmetic number, because the mean of its divisors is an integer number (2063340).

Almost surely, 2^20426769 is an apocalyptic number.

It is an amenable number.

20426769 is a deficient number, since it is larger than the sum of its proper divisors (12586671).

20426769 is a wasteful number, since it uses less digits than its factorization.

20426769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68797 (or 68791 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 20426769 is about 4519.5983228601. The cubic root of 20426769 is about 273.3589048387.

The spelling of 20426769 in words is "twenty million, four hundred twenty-six thousand, seven hundred sixty-nine".