20195566 has 4 divisors (see below), whose sum is σ = 30293352. Its totient is φ = 10097782.

The previous prime is 20195557. The next prime is 20195573. The reversal of 20195566 is 66559102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5048890 + ... + 5048893.

It is an arithmetic number, because the mean of its divisors is an integer number (7573338).

Almost surely, 2^20195566 is an apocalyptic number.

20195566 is a deficient number, since it is larger than the sum of its proper divisors (10097786).

20195566 is a wasteful number, since it uses less digits than its factorization.

20195566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10097785.

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 20195566 is about 4493.9477077509. The cubic root of 20195566 is about 272.3236397782.

The spelling of 20195566 in words is "twenty million, one hundred ninety-five thousand, five hundred sixty-six".