20187946 has 8 divisors (see below), whose sum is σ = 30310884. Its totient is φ = 10084320.

The previous prime is 20187917. The next prime is 20187961. The reversal of 20187946 is 64978102.

It can be written as a sum of positive squares in 2 ways, for example, as 19456921 + 731025 = 4411^2 + 855^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1845 + ... + 6616.

Almost surely, 2^20187946 is an apocalyptic number.

20187946 is a deficient number, since it is larger than the sum of its proper divisors (10122938).

20187946 is a wasteful number, since it uses less digits than its factorization.

20187946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9656.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 20187946 is about 4493.0998208364. The cubic root of 20187946 is about 272.2893852761.

The spelling of 20187946 in words is "twenty million, one hundred eighty-seven thousand, nine hundred forty-six".