20186490 has 16 divisors (see below), whose sum is σ = 48447648. Its totient is φ = 5383056.

The previous prime is 20186461. The next prime is 20186501. The reversal of 20186490 is 9468102.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 672883 = 20186490 / (2 + 0 + 1 + 8 + 6 + 4 + 9 + 0).

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 7 ways as a sum of consecutive naturals, for example, 336412 + ... + 336471.

It is an arithmetic number, because the mean of its divisors is an integer number (3027978).

Almost surely, 2^20186490 is an apocalyptic number.

20186490 is an abundant number, since it is smaller than the sum of its proper divisors (28261158).

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

20186490 is a wasteful number, since it uses less digits than its factorization.

20186490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672893.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 20186490 is about 4492.9377916904. The cubic root of 20186490 is about 272.2828390780.

The spelling of 20186490 in words is "twenty million, one hundred eighty-six thousand, four hundred ninety".