20392730 has 32 divisors (see below), whose sum is σ = 38223360. Its totient is φ = 7824960.

The previous prime is 20392717. The next prime is 20392739. The reversal of 20392730 is 3729302.

It is a super-4 number, since 4×20392730⁴ (a number of 30 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20392730.

It is not an unprimeable number, because it can be changed into a prime (20392739) 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 15 ways as a sum of consecutive naturals, for example, 48461 + ... + 48879.

It is an arithmetic number, because the mean of its divisors is an integer number (1194480).

Almost surely, 2^20392730 is an apocalyptic number.

20392730 is a deficient number, since it is larger than the sum of its proper divisors (17830630).

20392730 is a wasteful number, since it uses less digits than its factorization.

20392730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614.

The product of its (nonzero) digits is 2268, while the sum is 26.

The square root of 20392730 is about 4515.8310420121. The cubic root of 20392730 is about 273.2069794075.

The spelling of 20392730 in words is "twenty million, three hundred ninety-two thousand, seven hundred thirty".