20000290 has 8 divisors (see below), whose sum is σ = 36000540. Its totient is φ = 8000112.

The previous prime is 20000287. The next prime is 20000297. The reversal of 20000290 is 9200002.

It can be written as a sum of positive squares in 2 ways, for example, as 18567481 + 1432809 = 4309^2 + 1197^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 20000290.

It is not an unprimeable number, because it can be changed into a prime (20000297) 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, 1000005 + ... + 1000024.

Almost surely, 2^20000290 is an apocalyptic number.

20000290 is a deficient number, since it is larger than the sum of its proper divisors (16000250).

20000290 is a wasteful number, since it uses less digits than its factorization.

20000290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2000036.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 20000290 is about 4472.1683778677. The cubic root of 20000290 is about 271.4430736217.

Adding to 20000290 its reverse (9200002), we get a palindrome (29200292).

The spelling of 20000290 in words is "twenty million, two hundred ninety", and thus it is an aban number.