20390958 has 72 divisors (see below), whose sum is σ = 52373880. Its totient is φ = 5715360.

The previous prime is 20390947. The next prime is 20391037. The reversal of 20390958 is 85909302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 53613 + ... + 53991.

It is an arithmetic number, because the mean of its divisors is an integer number (727415).

Almost surely, 2^20390958 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20390958, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26186940).

20390958 is an abundant number, since it is smaller than the sum of its proper divisors (31982922).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20390958 is a wasteful number, since it uses less digits than its factorization.

20390958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462 (or 452 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 20390958 is about 4515.6348390896. The cubic root of 20390958 is about 273.1990658555.

The spelling of 20390958 in words is "twenty million, three hundred ninety thousand, nine hundred fifty-eight".