20207290 has 8 divisors (see below), whose sum is σ = 36373140. Its totient is φ = 8082912.

The previous prime is 20207281. The next prime is 20207303. The reversal of 20207290 is 9270202.

It can be written as a sum of positive squares in 2 ways, for example, as 20151121 + 56169 = 4489^2 + 237^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1010355 + ... + 1010374.

Almost surely, 2^20207290 is an apocalyptic number.

20207290 is a deficient number, since it is larger than the sum of its proper divisors (16165850).

20207290 is a wasteful number, since it uses less digits than its factorization.

20207290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2020736.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 20207290 is about 4495.2519395469. The cubic root of 20207290 is about 272.3763263388.

Adding to 20207290 its reverse (9270202), we get a palindrome (29477492).

The spelling of 20207290 in words is "twenty million, two hundred seven thousand, two hundred ninety".