20047290 has 16 divisors (see below), whose sum is σ = 48113568. Its totient is φ = 5345936.

The previous prime is 20047289. The next prime is 20047327. The reversal of 20047290 is 9274002.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20047290.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 334092 + ... + 334151.

It is an arithmetic number, because the mean of its divisors is an integer number (3007098).

Almost surely, 2^20047290 is an apocalyptic number.

20047290 is an abundant number, since it is smaller than the sum of its proper divisors (28066278).

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

20047290 is a wasteful number, since it uses less digits than its factorization.

20047290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668253.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 20047290 is about 4477.4200160360. The cubic root of 20047290 is about 271.6555346077.

The spelling of 20047290 in words is "twenty million, forty-seven thousand, two hundred ninety".