20290265 has 8 divisors (see below), whose sum is σ = 25780680. Its totient is φ = 15277312.

The previous prime is 20290261. The next prime is 20290297. The reversal of 20290265 is 56209202.

It can be written as a sum of positive squares in 4 ways, for example, as 4481689 + 15808576 = 2117^2 + 3976^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20290265 - 2² = 20290261 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20290261) 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, 119270 + ... + 119439.

It is an arithmetic number, because the mean of its divisors is an integer number (3222585).

Almost surely, 2^20290265 is an apocalyptic number.

It is an amenable number.

20290265 is a deficient number, since it is larger than the sum of its proper divisors (5490415).

20290265 is a wasteful number, since it uses less digits than its factorization.

20290265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238731.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 20290265 is about 4504.4716671326. The cubic root of 20290265 is about 272.7486269980.

Adding to 20290265 its reverse (56209202), we get a palindrome (76499467).

The spelling of 20290265 in words is "twenty million, two hundred ninety thousand, two hundred sixty-five".