20958958 has 4 divisors (see below), whose sum is σ = 31438440. Its totient is φ = 10479478.

The previous prime is 20958953. The next prime is 20958961. The reversal of 20958958 is 85985902.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20958953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5239738 + ... + 5239741.

It is an arithmetic number, because the mean of its divisors is an integer number (7859610).

Almost surely, 2^20958958 is an apocalyptic number.

20958958 is a deficient number, since it is larger than the sum of its proper divisors (10479482).

20958958 is a wasteful number, since it uses less digits than its factorization.

20958958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10479481.

The product of its (nonzero) digits is 259200, while the sum is 46.

The square root of 20958958 is about 4578.0954555361. The cubic root of 20958958 is about 275.7125674599.

The spelling of 20958958 in words is "twenty million, nine hundred fifty-eight thousand, nine hundred fifty-eight".