20807700 has 72 divisors (see below), whose sum is σ = 61641888. Its totient is φ = 5416320.

The previous prime is 20807693. The next prime is 20807713. The reversal of 20807700 is 770802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12094 + ... + 13706.

Almost surely, 2^20807700 is an apocalyptic number.

20807700 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 20807700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30820944).

20807700 is an abundant number, since it is smaller than the sum of its proper divisors (40834188).

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

20807700 is a wasteful number, since it uses less digits than its factorization.

20807700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1673 (or 1666 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 24.

The square root of 20807700 is about 4561.5457906284. The cubic root of 20807700 is about 275.0477052226.

The spelling of 20807700 in words is "twenty million, eight hundred seven thousand, seven hundred".