20993460 has 96 divisors (see below), whose sum is σ = 61501440. Its totient is φ = 5346432.

The previous prime is 20993447. The next prime is 20993471. The reversal of 20993460 is 6439902.

It is a congruent number.

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, 203769 + ... + 203871.

It is an arithmetic number, because the mean of its divisors is an integer number (640640).

Almost surely, 2^20993460 is an apocalyptic number.

20993460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20993460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30750720).

20993460 is an abundant number, since it is smaller than the sum of its proper divisors (40507980).

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

20993460 is a wasteful number, since it uses less digits than its factorization.

20993460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237 (or 235 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 20993460 is about 4581.8620668894. The cubic root of 20993460 is about 275.8637744040.

The spelling of 20993460 in words is "twenty million, nine hundred ninety-three thousand, four hundred sixty".