20290516 has 12 divisors (see below), whose sum is σ = 35595700. Its totient is φ = 10120320.

The previous prime is 20290493. The next prime is 20290519. The reversal of 20290516 is 61509202.

It can be written as a sum of positive squares in 2 ways, for example, as 5080516 + 15210000 = 2254^2 + 3900^2 .

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20290519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4341 + ... + 7708.

Almost surely, 2^20290516 is an apocalyptic number.

It is an amenable number.

20290516 is a deficient number, since it is larger than the sum of its proper divisors (15305184).

20290516 is a wasteful number, since it uses less digits than its factorization.

20290516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12474 (or 12472 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 20290516 is about 4504.4995282495. The cubic root of 20290516 is about 272.7497516691.

Adding to 20290516 its reverse (61509202), we get a palindrome (81799718).

The spelling of 20290516 in words is "twenty million, two hundred ninety thousand, five hundred sixteen".