20028700 has 36 divisors (see below), whose sum is σ = 44294040. Its totient is φ = 7858240.

The previous prime is 20028691. The next prime is 20028707. The reversal of 20028700 is 782002.

20028700 = T₂₀₅ + T₂₀₆ + ... + T₅₀₄.

It is a super-2 number, since 2×20028700² = 802297647380000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20028707) 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, 3411 + ... + 7189.

It is an arithmetic number, because the mean of its divisors is an integer number (1230390).

Almost surely, 2^20028700 is an apocalyptic number.

20028700 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 20028700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22147020).

20028700 is an abundant number, since it is smaller than the sum of its proper divisors (24265340).

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

20028700 is a wasteful number, since it uses less digits than its factorization.

20028700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3846 (or 3839 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 20028700 is about 4475.3435622307. The cubic root of 20028700 is about 271.5715392450.

It can be divided in two parts, 200 and 28700, that added together give a square (28900 = 170²).

The spelling of 20028700 in words is "twenty million, twenty-eight thousand, seven hundred".