20858994 has 36 divisors (see below), whose sum is σ = 48945546. Its totient is φ = 6417216.

The previous prime is 20858987. The next prime is 20859029. The reversal of 20858994 is 49985802.

It can be written as a sum of positive squares in 3 ways, for example, as 3744225 + 17114769 = 1935^2 + 4137^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 387 + ... + 6470.

Almost surely, 2^20858994 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20858994, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24472773).

20858994 is an abundant number, since it is smaller than the sum of its proper divisors (28086552).

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

20858994 is a wasteful number, since it uses less digits than its factorization.

20858994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6891 (or 6875 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The square root of 20858994 is about 4567.1647660228. The cubic root of 20858994 is about 275.2735305956.

It can be divided in two parts, 2085899 and 4, that added together give a triangular number (2085903 = T₂₀₄₂).

The spelling of 20858994 in words is "twenty million, eight hundred fifty-eight thousand, nine hundred ninety-four".