20881958 has 4 divisors (see below), whose sum is σ = 31322940. Its totient is φ = 10440978.

The previous prime is 20881921. The next prime is 20881963. The reversal of 20881958 is 85918802.

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, 5220488 + ... + 5220491.

It is an arithmetic number, because the mean of its divisors is an integer number (7830735).

Almost surely, 2^20881958 is an apocalyptic number.

20881958 is a deficient number, since it is larger than the sum of its proper divisors (10440982).

20881958 is a wasteful number, since it uses less digits than its factorization.

20881958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10440981.

The product of its (nonzero) digits is 46080, while the sum is 41.

The square root of 20881958 is about 4569.6781068255. The cubic root of 20881958 is about 275.3745112246.

The spelling of 20881958 in words is "twenty million, eight hundred eighty-one thousand, nine hundred fifty-eight".