20863800 has 144 divisors (see below), whose sum is σ = 71524440. Its totient is φ = 5448960.

The previous prime is 20863781. The next prime is 20863813. The reversal of 20863800 is 836802.

20863800 is a `hidden beast` number, since 20 + 8 + 638 + 0 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 120514 + ... + 120686.

Almost surely, 2^20863800 is an apocalyptic number.

20863800 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 20863800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35762220).

20863800 is an abundant number, since it is smaller than the sum of its proper divisors (50660640).

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

20863800 is a wasteful number, since it uses less digits than its factorization.

20863800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262 (or 250 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 20863800 is about 4567.6908827109. The cubic root of 20863800 is about 275.2946703654.

It can be divided in two parts, 2086 and 3800, that added together give a triangular number (5886 = T₁₀₈).

The spelling of 20863800 in words is "twenty million, eight hundred sixty-three thousand, eight hundred".