20517882 has 64 divisors (see below), whose sum is σ = 51840000. Its totient is φ = 5258880.

The previous prime is 20517881. The next prime is 20517901. The reversal of 20517882 is 28871502.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (20517881) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40869 + ... + 41367.

It is an arithmetic number, because the mean of its divisors is an integer number (810000).

Almost surely, 2^20517882 is an apocalyptic number.

20517882 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 20517882, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25920000).

20517882 is an abundant number, since it is smaller than the sum of its proper divisors (31322118).

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

20517882 is a wasteful number, since it uses less digits than its factorization.

20517882 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611.

The product of its (nonzero) digits is 8960, while the sum is 33.

The square root of 20517882 is about 4529.6668751686. Note that the first 3 decimals coincide. The cubic root of 20517882 is about 273.7647384738.

The spelling of 20517882 in words is "twenty million, five hundred seventeen thousand, eight hundred eighty-two".