20290642 has 8 divisors (see below), whose sum is σ = 30853116. Its totient is φ = 10006272.

The previous prime is 20290609. The next prime is 20290649. The reversal of 20290642 is 24609202.

It can be written as a sum of positive squares in 2 ways, for example, as 18156121 + 2134521 = 4261^2 + 1461^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20290649) 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, 69343 + ... + 69634.

Almost surely, 2^20290642 is an apocalyptic number.

20290642 is a deficient number, since it is larger than the sum of its proper divisors (10562474).

20290642 is a wasteful number, since it uses less digits than its factorization.

20290642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139052.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 20290642 is about 4504.5135142432. The cubic root of 20290642 is about 272.7503162415.

Adding to 20290642 its reverse (24609202), we get a palindrome (44899844).

The spelling of 20290642 in words is "twenty million, two hundred ninety thousand, six hundred forty-two".