20490578 has 8 divisors (see below), whose sum is σ = 30874368. Its totient is φ = 10199124.

The previous prime is 20490557. The next prime is 20490599. The reversal of 20490578 is 87509402.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20490557) and next prime (20490599).

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

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 3 ways as a sum of consecutive naturals, for example, 22526 + ... + 23417.

It is an arithmetic number, because the mean of its divisors is an integer number (3859296).

Almost surely, 2^20490578 is an apocalyptic number.

20490578 is a deficient number, since it is larger than the sum of its proper divisors (10383790).

20490578 is a wasteful number, since it uses less digits than its factorization.

20490578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46168.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 20490578 is about 4526.6519636482. The cubic root of 20490578 is about 273.6432478544.

The spelling of 20490578 in words is "twenty million, four hundred ninety thousand, five hundred seventy-eight".