20560390 has 16 divisors (see below), whose sum is σ = 38618208. Its totient is φ = 7866496.

The previous prime is 20560387. The next prime is 20560403. The reversal of 20560390 is 9306502.

It is a congruent number.

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, 44467 + ... + 44926.

It is an arithmetic number, because the mean of its divisors is an integer number (2413638).

Almost surely, 2^20560390 is an apocalyptic number.

20560390 is a deficient number, since it is larger than the sum of its proper divisors (18057818).

20560390 is a wasteful number, since it uses less digits than its factorization.

20560390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89423.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 20560390 is about 4534.3566247043. The cubic root of 20560390 is about 273.9536657759.

Adding to 20560390 its reverse (9306502), we get a palindrome (29866892).

The spelling of 20560390 in words is "twenty million, five hundred sixty thousand, three hundred ninety".