20854642 has 4 divisors (see below), whose sum is σ = 31281966. Its totient is φ = 10427320.

The previous prime is 20854601. The next prime is 20854649. The reversal of 20854642 is 24645802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20349121 + 505521 = 4511^2 + 711^2 .

It is not an unprimeable number, because it can be changed into a prime (20854649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5213659 + ... + 5213662.

Almost surely, 2^20854642 is an apocalyptic number.

20854642 is a deficient number, since it is larger than the sum of its proper divisors (10427324).

20854642 is a wasteful number, since it uses less digits than its factorization.

20854642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10427323.

The product of its (nonzero) digits is 15360, while the sum is 31.

The square root of 20854642 is about 4566.6882967858. The cubic root of 20854642 is about 275.2543849977.

The spelling of 20854642 in words is "twenty million, eight hundred fifty-four thousand, six hundred forty-two".