20858148 has 84 divisors (see below), whose sum is σ = 57290688. Its totient is φ = 6629040.

The previous prime is 20858147. The next prime is 20858153. The reversal of 20858148 is 84185802.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nialpdrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (20858147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 66913 + ... + 67223.

It is an arithmetic number, because the mean of its divisors is an integer number (682032).

Almost surely, 2^20858148 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20858148, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28645344).

20858148 is an abundant number, since it is smaller than the sum of its proper divisors (36432540).

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

20858148 is a wasteful number, since it uses less digits than its factorization.

20858148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356 (or 339 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 36.

The square root of 20858148 is about 4567.0721474485. The cubic root of 20858148 is about 275.2698090266.

The spelling of 20858148 in words is "twenty million, eight hundred fifty-eight thousand, one hundred forty-eight".