20424770 has 8 divisors (see below), whose sum is σ = 36764604. Its totient is φ = 8169904.

The previous prime is 20424731. The next prime is 20424773. The reversal of 20424770 is 7742402.

It can be written as a sum of positive squares in 2 ways, for example, as 19386409 + 1038361 = 4403^2 + 1019^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20424773) 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 3 ways as a sum of consecutive naturals, for example, 1021229 + ... + 1021248.

Almost surely, 2^20424770 is an apocalyptic number.

20424770 is a deficient number, since it is larger than the sum of its proper divisors (16339834).

20424770 is a wasteful number, since it uses less digits than its factorization.

20424770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2042484.

The product of its (nonzero) digits is 3136, while the sum is 26.

The square root of 20424770 is about 4519.3771694781. The cubic root of 20424770 is about 273.3499874181.

The spelling of 20424770 in words is "twenty million, four hundred twenty-four thousand, seven hundred seventy".