20863040 has 56 divisors (see below), whose sum is σ = 54205632. Its totient is φ = 7585280.

The previous prime is 20863039. The next prime is 20863067. The reversal of 20863040 is 4036802.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20862997 and 20863015.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 557 + ... + 6483.

Almost surely, 2^20863040 is an apocalyptic number.

20863040 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 20863040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27102816).

20863040 is an abundant number, since it is smaller than the sum of its proper divisors (33342592).

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

20863040 is a wasteful number, since it uses less digits than its factorization.

20863040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5955 (or 5945 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 20863040 is about 4567.6076889330. The cubic root of 20863040 is about 275.2913276300.

Adding to 20863040 its reverse (4036802), we get a palindrome (24899842).

The spelling of 20863040 in words is "twenty million, eight hundred sixty-three thousand, forty".