20873758 has 4 divisors (see below), whose sum is σ = 31310640. Its totient is φ = 10436878.

The previous prime is 20873747. The next prime is 20873759. The reversal of 20873758 is 85737802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85737802 = 2 ⋅42868901.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 20873758.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20873759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5218438 + ... + 5218441.

It is an arithmetic number, because the mean of its divisors is an integer number (7827660).

Almost surely, 2^20873758 is an apocalyptic number.

20873758 is a deficient number, since it is larger than the sum of its proper divisors (10436882).

20873758 is a wasteful number, since it uses less digits than its factorization.

20873758 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10436881.

The product of its (nonzero) digits is 94080, while the sum is 40.

The square root of 20873758 is about 4568.7808001698. The cubic root of 20873758 is about 275.3384614981.

The spelling of 20873758 in words is "twenty million, eight hundred seventy-three thousand, seven hundred fifty-eight".