20699800 has 72 divisors (see below), whose sum is σ = 53049060. Its totient is φ = 7449600.

The previous prime is 20699779. The next prime is 20699803. The reversal of 20699800 is 899602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20699803) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 213352 + ... + 213448.

Almost surely, 2^20699800 is an apocalyptic number.

20699800 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 20699800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26524530).

20699800 is an abundant number, since it is smaller than the sum of its proper divisors (32349260).

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

20699800 is a wasteful number, since it uses less digits than its factorization.

20699800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221 (or 115 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 20699800 is about 4549.7032870287. The cubic root of 20699800 is about 274.5714537339.

The spelling of 20699800 in words is "twenty million, six hundred ninety-nine thousand, eight hundred".