20814840 has 64 divisors (see below), whose sum is σ = 69386400. Its totient is φ = 5550336.

The previous prime is 20814811. The next prime is 20814863. The reversal of 20814840 is 4841802.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8557 + ... + 10716.

Almost surely, 2^20814840 is an apocalyptic number.

20814840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20814840 is an abundant number, since it is smaller than the sum of its proper divisors (48571560).

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

20814840 is a wasteful number, since it uses less digits than its factorization.

20814840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19293 (or 19283 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 20814840 is about 4562.3283529356. The cubic root of 20814840 is about 275.0791617832.

The spelling of 20814840 in words is "twenty million, eight hundred fourteen thousand, eight hundred forty".