20973158 has 4 divisors (see below), whose sum is σ = 31459740. Its totient is φ = 10486578.

The previous prime is 20973133. The next prime is 20973163. The reversal of 20973158 is 85137902.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5243288 + ... + 5243291.

It is an arithmetic number, because the mean of its divisors is an integer number (7864935).

Almost surely, 2^20973158 is an apocalyptic number.

20973158 is a deficient number, since it is larger than the sum of its proper divisors (10486582).

20973158 is a wasteful number, since it uses less digits than its factorization.

20973158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10486581.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 20973158 is about 4579.6460561926. The cubic root of 20973158 is about 275.7748198328.

The spelling of 20973158 in words is "twenty million, nine hundred seventy-three thousand, one hundred fifty-eight".