20305134 has 16 divisors (see below), whose sum is σ = 45122640. Its totient is φ = 6768360.

The previous prime is 20305097. The next prime is 20305151. The reversal of 20305134 is 43150302.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187957 + ... + 188064.

It is an arithmetic number, because the mean of its divisors is an integer number (2820165).

Almost surely, 2^20305134 is an apocalyptic number.

20305134 is an abundant number, since it is smaller than the sum of its proper divisors (24817506).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20305134 is a wasteful number, since it uses less digits than its factorization.

20305134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376032 (or 376026 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 20305134 is about 4506.1218359028. The cubic root of 20305134 is about 272.8152354445.

Adding to 20305134 its reverse (43150302), we get a palindrome (63455436).

The spelling of 20305134 in words is "twenty million, three hundred five thousand, one hundred thirty-four".