20235290 has 8 divisors (see below), whose sum is σ = 36423540. Its totient is φ = 8094112.

The previous prime is 20235269. The next prime is 20235329. The reversal of 20235290 is 9253202.

It can be written as a sum of positive squares in 2 ways, for example, as 17952169 + 2283121 = 4237^2 + 1511^2 .

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

It is a super-2 number, since 2×20235290² = 818933922768200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1011755 + ... + 1011774.

Almost surely, 2^20235290 is an apocalyptic number.

20235290 is a deficient number, since it is larger than the sum of its proper divisors (16188250).

20235290 is a wasteful number, since it uses less digits than its factorization.

20235290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2023536.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 20235290 is about 4498.3652586245. The cubic root of 20235290 is about 272.5020733226.

Adding to 20235290 its reverse (9253202), we get a palindrome (29488492).

The spelling of 20235290 in words is "twenty million, two hundred thirty-five thousand, two hundred ninety".