20931842 has 8 divisors (see below), whose sum is σ = 31461696. Its totient is φ = 10444612.

The previous prime is 20931809. The next prime is 20931877. The reversal of 20931842 is 24813902.

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

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, 9398 + ... + 11409.

It is an arithmetic number, because the mean of its divisors is an integer number (3932712).

Almost surely, 2^20931842 is an apocalyptic number.

20931842 is a deficient number, since it is larger than the sum of its proper divisors (10529854).

20931842 is a wasteful number, since it uses less digits than its factorization.

20931842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21312.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 20931842 is about 4575.1330035312. The cubic root of 20931842 is about 275.5936135746.

The spelling of 20931842 in words is "twenty million, nine hundred thirty-one thousand, eight hundred forty-two".