20391486 has 8 divisors (see below), whose sum is σ = 40782984. Its totient is φ = 6797160.

The previous prime is 20391479. The next prime is 20391487. The reversal of 20391486 is 68419302.

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

20391486 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20391487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1699285 + ... + 1699296.

It is an arithmetic number, because the mean of its divisors is an integer number (5097873).

Almost surely, 2^20391486 is an apocalyptic number.

20391486 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20391486 is a wasteful number, since it uses less digits than its factorization.

20391486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3398586.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 20391486 is about 4515.6933022516. The cubic root of 20391486 is about 273.2014238918.

The spelling of 20391486 in words is "twenty million, three hundred ninety-one thousand, four hundred eighty-six".