20612290 has 16 divisors (see below), whose sum is σ = 37268280. Its totient is φ = 8208000.

The previous prime is 20612269. The next prime is 20612341. The reversal of 20612290 is 9221602.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17799961 + 2812329 = 4219^2 + 1677^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2211 + ... + 6790.

Almost surely, 2^20612290 is an apocalyptic number.

20612290 is a deficient number, since it is larger than the sum of its proper divisors (16655990).

20612290 is a wasteful number, since it uses less digits than its factorization.

20612290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9237.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 20612290 is about 4540.0759905535. The cubic root of 20612290 is about 274.1839832047.

Adding to 20612290 its reverse (9221602), we get a palindrome (29833892).

It can be divided in two parts, 20612 and 290, that added together give a palindrome (20902).

The spelling of 20612290 in words is "twenty million, six hundred twelve thousand, two hundred ninety".