20840946 has 64 divisors (see below), whose sum is σ = 51114240. Its totient is φ = 5548800.

The previous prime is 20840933. The next prime is 20840951. The reversal of 20840946 is 64904802.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 206296 + ... + 206396.

It is an arithmetic number, because the mean of its divisors is an integer number (798660).

Almost surely, 2^20840946 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20840946, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25557120).

20840946 is an abundant number, since it is smaller than the sum of its proper divisors (30273294).

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

20840946 is a wasteful number, since it uses less digits than its factorization.

20840946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164 (or 130 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 20840946 is about 4565.1884955607. The cubic root of 20840946 is about 275.1941152885.

The spelling of 20840946 in words is "twenty million, eight hundred forty thousand, nine hundred forty-six".