20290407 has 8 divisors (see below), whose sum is σ = 27160176. Its totient is φ = 13473792.

The previous prime is 20290397. The next prime is 20290421. The reversal of 20290407 is 70409202.

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

It is not a de Polignac number, because 20290407 - 2¹² = 20286311 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20290427) 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, 12388 + ... + 13929.

It is an arithmetic number, because the mean of its divisors is an integer number (3395022).

Almost surely, 2^20290407 is an apocalyptic number.

20290407 is a deficient number, since it is larger than the sum of its proper divisors (6869769).

20290407 is a wasteful number, since it uses less digits than its factorization.

20290407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26577.

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

The square root of 20290407 is about 4504.4874292199. The cubic root of 20290407 is about 272.7492632672.

Adding to 20290407 its reverse (70409202), we get a palindrome (90699609).

It can be divided in two parts, 202 and 90407, that added together give a palindrome (90609).

The spelling of 20290407 in words is "twenty million, two hundred ninety thousand, four hundred seven".