20290090 has 16 divisors (see below), whose sum is σ = 36714888. Its totient is φ = 8073216.

The previous prime is 20290051. The next prime is 20290091. The reversal of 20290090 is 9009202.

It can be written as a sum of positive squares in 4 ways, for example, as 6205081 + 14085009 = 2491^2 + 3753^2 .

It is not an unprimeable number, because it can be changed into a prime (20290091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3327 + ... + 7186.

Almost surely, 2^20290090 is an apocalyptic number.

20290090 is a deficient number, since it is larger than the sum of its proper divisors (16424798).

20290090 is a wasteful number, since it uses less digits than its factorization.

20290090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10713.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 20290090 is about 4504.4522419491. The cubic root of 20290090 is about 272.7478428593.

Adding to 20290090 its reverse (9009202), we get a palindrome (29299292).

The spelling of 20290090 in words is "twenty million, two hundred ninety thousand, ninety".