20734400 has 42 divisors (see below), whose sum is σ = 51023520. Its totient is φ = 8293120.

The previous prime is 20734369. The next prime is 20734403. The reversal of 20734400 is 443702.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20734403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4880 + ... + 8079.

Almost surely, 2^20734400 is an apocalyptic number.

20734400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20734400 is an abundant number, since it is smaller than the sum of its proper divisors (30289120).

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

20734400 is a wasteful number, since it uses less digits than its factorization.

20734400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12981 (or 12966 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 20.

The square root of 20734400 is about 4553.5041451612. The cubic root of 20734400 is about 274.7243518937.

The spelling of 20734400 in words is "twenty million, seven hundred thirty-four thousand, four hundred".