20345146 has 16 divisors (see below), whose sum is σ = 31002624. Its totient is φ = 10012464.

The previous prime is 20345093. The next prime is 20345161. The reversal of 20345146 is 64154302.

It is a super-2 number, since 2×20345146² = 827849931522632, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20345146.

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 7 ways as a sum of consecutive naturals, for example, 43711 + ... + 44173.

It is an arithmetic number, because the mean of its divisors is an integer number (1937664).

Almost surely, 2^20345146 is an apocalyptic number.

20345146 is a deficient number, since it is larger than the sum of its proper divisors (10657478).

20345146 is a wasteful number, since it uses less digits than its factorization.

20345146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 20345146 is about 4510.5593888120. The cubic root of 20345146 is about 272.9943152935.

Adding to 20345146 its reverse (64154302), we get a palindrome (84499448).

The spelling of 20345146 in words is "twenty million, three hundred forty-five thousand, one hundred forty-six".