20425730 has 32 divisors (see below), whose sum is σ = 40449024. Its totient is φ = 7379136.

The previous prime is 20425729. The next prime is 20425759. The reversal of 20425730 is 3752402.

It is a junction number, because it is equal to n+sod(n) for n = 20425696 and 20425705.

It is an unprimeable number.

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, 4439 + ... + 7781.

It is an arithmetic number, because the mean of its divisors is an integer number (1264032).

Almost surely, 2^20425730 is an apocalyptic number.

20425730 is a deficient number, since it is larger than the sum of its proper divisors (20023294).

20425730 is a wasteful number, since it uses less digits than its factorization.

20425730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3410.

The product of its (nonzero) digits is 1680, while the sum is 23.

The square root of 20425730 is about 4519.4833775554. The cubic root of 20425730 is about 273.3542699939.

The spelling of 20425730 in words is "twenty million, four hundred twenty-five thousand, seven hundred thirty".