20303745 has 32 divisors (see below), whose sum is σ = 40504320. Its totient is φ = 8437440.

The previous prime is 20303719. The next prime is 20303807. The reversal of 20303745 is 54730302.

It is not a de Polignac number, because 20303745 - 2⁶ = 20303681 is a prime.

It is a super-2 number, since 2×20303745² = 824484122050050, which contains 22 as substring.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 7635 + ... + 9944.

It is an arithmetic number, because the mean of its divisors is an integer number (1265760).

Almost surely, 2^20303745 is an apocalyptic number.

It is an amenable number.

20303745 is a deficient number, since it is larger than the sum of its proper divisors (20200575).

20303745 is a wasteful number, since it uses less digits than its factorization.

20303745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17605.

The product of its (nonzero) digits is 2520, while the sum is 24.

The square root of 20303745 is about 4505.9677096047. The cubic root of 20303745 is about 272.8090145383.

It can be divided in two parts, 2030 and 3745, that added together give a palindrome (5775).

The spelling of 20303745 in words is "twenty million, three hundred three thousand, seven hundred forty-five".