20415730 has 16 divisors (see below), whose sum is σ = 36963864. Its totient is φ = 8118400.

The previous prime is 20415713. The next prime is 20415737. The reversal of 20415730 is 3751402.

It can be written as a sum of positive squares in 4 ways, for example, as 19545241 + 870489 = 4421^2 + 933^2 .

It is not an unprimeable number, because it can be changed into a prime (20415737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4171 + ... + 7630.

Almost surely, 2^20415730 is an apocalyptic number.

20415730 is a deficient number, since it is larger than the sum of its proper divisors (16548134).

20415730 is a wasteful number, since it uses less digits than its factorization.

20415730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11981.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 20415730 is about 4518.3769209751. The cubic root of 20415730 is about 273.3096532463.

The spelling of 20415730 in words is "twenty million, four hundred fifteen thousand, seven hundred thirty".