20402342 has 4 divisors (see below), whose sum is σ = 30603516. Its totient is φ = 10201170.

The previous prime is 20402321. The next prime is 20402351. The reversal of 20402342 is 24320402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24320402 = 2 ⋅12160201.

It is a self number, because there is not a number n which added to its sum of digits gives 20402342.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5100584 + ... + 5100587.

It is an arithmetic number, because the mean of its divisors is an integer number (7650879).

Almost surely, 2^20402342 is an apocalyptic number.

20402342 is a deficient number, since it is larger than the sum of its proper divisors (10201174).

20402342 is a wasteful number, since it uses less digits than its factorization.

20402342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10201173.

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 20402342 is about 4516.8951725715. The cubic root of 20402342 is about 273.2498975291.

Adding to 20402342 its reverse (24320402), we get a palindrome (44722744).

The spelling of 20402342 in words is "twenty million, four hundred two thousand, three hundred forty-two".