20543886 has 48 divisors (see below), whose sum is σ = 50139648. Its totient is φ = 6022800.

The previous prime is 20543881. The next prime is 20543891. The reversal of 20543886 is 68834502.

It is an interprime number because it is at equal distance from previous prime (20543881) and next prime (20543891).

It is a self number, because there is not a number n which added to its sum of digits gives 20543886.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20543881) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4465 + ... + 7811.

It is an arithmetic number, because the mean of its divisors is an integer number (1044576).

Almost surely, 2^20543886 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20543886, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25069824).

20543886 is an abundant number, since it is smaller than the sum of its proper divisors (29595762).

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

20543886 is a wasteful number, since it uses less digits than its factorization.

20543886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3397 (or 3394 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 20543886 is about 4532.5363760261. The cubic root of 20543886 is about 273.8803445077.

The spelling of 20543886 in words is "twenty million, five hundred forty-three thousand, eight hundred eighty-six".