20424769 has 8 divisors (see below), whose sum is σ = 22035240. Its totient is φ = 18859776.

The previous prime is 20424731. The next prime is 20424773. The reversal of 20424769 is 96742402.

It can be written as a sum of positive squares in 4 ways, for example, as 13727025 + 6697744 = 3705^2 + 2588^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20424769 - 2²³ = 12036161 is a prime.

It is a super-2 number, since 2×20424769² = 834342377406722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20424169) 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 7 ways as a sum of consecutive naturals, for example, 10434 + ... + 12235.

It is an arithmetic number, because the mean of its divisors is an integer number (2754405).

Almost surely, 2^20424769 is an apocalyptic number.

It is an amenable number.

20424769 is a deficient number, since it is larger than the sum of its proper divisors (1610471).

20424769 is a wasteful number, since it uses less digits than its factorization.

20424769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22739.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 20424769 is about 4519.3770588434. The cubic root of 20424769 is about 273.3499829570.

The spelling of 20424769 in words is "twenty million, four hundred twenty-four thousand, seven hundred sixty-nine".