20873542 has 4 divisors (see below), whose sum is σ = 31310316. Its totient is φ = 10436770.

The previous prime is 20873539. The next prime is 20873563. The reversal of 20873542 is 24537802.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5218384 + ... + 5218387.

It is an arithmetic number, because the mean of its divisors is an integer number (7827579).

Almost surely, 2^20873542 is an apocalyptic number.

20873542 is a deficient number, since it is larger than the sum of its proper divisors (10436774).

20873542 is a wasteful number, since it uses less digits than its factorization.

20873542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10436773.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 20873542 is about 4568.7571614171. The cubic root of 20873542 is about 275.3375117679.

The spelling of 20873542 in words is "twenty million, eight hundred seventy-three thousand, five hundred forty-two".