20342090 has 8 divisors (see below), whose sum is σ = 36615780. Its totient is φ = 8136832.

The previous prime is 20342083. The next prime is 20342093. The reversal of 20342090 is 9024302.

It can be written as a sum of positive squares in 2 ways, for example, as 20151121 + 190969 = 4489^2 + 437^2 .

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 (20342093) 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, 1017095 + ... + 1017114.

Almost surely, 2^20342090 is an apocalyptic number.

20342090 is a deficient number, since it is larger than the sum of its proper divisors (16273690).

20342090 is a wasteful number, since it uses less digits than its factorization.

20342090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2034216.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 20342090 is about 4510.2206154467. The cubic root of 20342090 is about 272.9806459822.

Adding to 20342090 its reverse (9024302), we get a palindrome (29366392).

The spelling of 20342090 in words is "twenty million, three hundred forty-two thousand, ninety".