20187730 has 8 divisors (see below), whose sum is σ = 36337932. Its totient is φ = 8075088.

The previous prime is 20187719. The next prime is 20187757. The reversal of 20187730 is 3778102.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19918369 + 269361 = 4463^2 + 519^2 .

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, 1009377 + ... + 1009396.

Almost surely, 2^20187730 is an apocalyptic number.

20187730 is a deficient number, since it is larger than the sum of its proper divisors (16150202).

20187730 is a wasteful number, since it uses less digits than its factorization.

20187730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2018780.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 20187730 is about 4493.0757839146. The cubic root of 20187730 is about 272.2884141567.

The spelling of 20187730 in words is "twenty million, one hundred eighty-seven thousand, seven hundred thirty".