20195630 has 32 divisors (see below), whose sum is σ = 44743104. Its totient is φ = 6391296.

The previous prime is 20195621. The next prime is 20195647. The reversal of 20195630 is 3659102.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 20195630.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10187 + ... + 12006.

It is an arithmetic number, because the mean of its divisors is an integer number (1398222).

Almost surely, 2^20195630 is an apocalyptic number.

20195630 is an abundant number, since it is smaller than the sum of its proper divisors (24547474).

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

20195630 is a wasteful number, since it uses less digits than its factorization.

20195630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22220.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 20195630 is about 4493.9548284334. The cubic root of 20195630 is about 272.3239274436.

The spelling of 20195630 in words is "twenty million, one hundred ninety-five thousand, six hundred thirty".