20847700 has 36 divisors (see below), whose sum is σ = 45552640. Its totient is φ = 8281440.

The previous prime is 20847679. The next prime is 20847703. The reversal of 20847700 is 774802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20847703) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15661 + ... + 16939.

Almost surely, 2^20847700 is an apocalyptic number.

20847700 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 20847700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22776320).

20847700 is an abundant number, since it is smaller than the sum of its proper divisors (24704940).

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

20847700 is a wasteful number, since it uses less digits than its factorization.

20847700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1456 (or 1449 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 28.

The square root of 20847700 is about 4565.9281641305. The cubic root of 20847700 is about 275.2238397919.

The spelling of 20847700 in words is "twenty million, eight hundred forty-seven thousand, seven hundred".