20840342 has 16 divisors (see below), whose sum is σ = 31994352. Its totient is φ = 10177440.

The previous prime is 20840311. The next prime is 20840363. The reversal of 20840342 is 24304802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44393 + ... + 44859.

It is an arithmetic number, because the mean of its divisors is an integer number (1999647).

Almost surely, 2^20840342 is an apocalyptic number.

20840342 is a deficient number, since it is larger than the sum of its proper divisors (11154010).

20840342 is a wasteful number, since it uses less digits than its factorization.

20840342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 943.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 20840342 is about 4565.1223422817. The cubic root of 20840342 is about 275.1914567583.

The spelling of 20840342 in words is "twenty million, eight hundred forty thousand, three hundred forty-two".