20491594 has 8 divisors (see below), whose sum is σ = 31170528. Its totient is φ = 10101420.

The previous prime is 20491591. The next prime is 20491609. The reversal of 20491594 is 49519402.

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

It is not an unprimeable number, because it can be changed into a prime (20491591) 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, 72012 + ... + 72295.

It is an arithmetic number, because the mean of its divisors is an integer number (3896316).

Almost surely, 2^20491594 is an apocalyptic number.

20491594 is a deficient number, since it is larger than the sum of its proper divisors (10678934).

20491594 is a wasteful number, since it uses less digits than its factorization.

20491594 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144380.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 20491594 is about 4526.7641864802. The cubic root of 20491594 is about 273.6477705338.

The spelling of 20491594 in words is "twenty million, four hundred ninety-one thousand, five hundred ninety-four".