20342542 has 8 divisors (see below), whose sum is σ = 33287832. Its totient is φ = 9246600.

The previous prime is 20342537. The next prime is 20342573. The reversal of 20342542 is 24524302.

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

It is a Harshad number since it is a multiple of its sum of digits (22), and also a Moran number because the ratio is a prime number: 924661 = 20342542 / (2 + 0 + 3 + 4 + 2 + 5 + 4 + 2).

It is a congruent number.

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, 462309 + ... + 462352.

It is an arithmetic number, because the mean of its divisors is an integer number (4160979).

Almost surely, 2^20342542 is an apocalyptic number.

20342542 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20342542 is a deficient number, since it is larger than the sum of its proper divisors (12945290).

20342542 is a wasteful number, since it uses less digits than its factorization.

20342542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 924674.

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 20342542 is about 4510.2707235819. The cubic root of 20342542 is about 272.9826678384.

Adding to 20342542 its reverse (24524302), we get a palindrome (44866844).

The spelling of 20342542 in words is "twenty million, three hundred forty-two thousand, five hundred forty-two".