20342390 has 8 divisors (see below), whose sum is σ = 36616320. Its totient is φ = 8136952.

The previous prime is 20342389. The next prime is 20342411. The reversal of 20342390 is 9324302.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1017110 + ... + 1017129.

It is an arithmetic number, because the mean of its divisors is an integer number (4577040).

Almost surely, 2^20342390 is an apocalyptic number.

20342390 is a deficient number, since it is larger than the sum of its proper divisors (16273930).

20342390 is a wasteful number, since it uses less digits than its factorization.

20342390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2034246.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 20342390 is about 4510.2538731207. The cubic root of 20342390 is about 272.9819879255.

Adding to 20342390 its reverse (9324302), we get a palindrome (29666692).

The spelling of 20342390 in words is "twenty million, three hundred forty-two thousand, three hundred ninety".