20543706 has 48 divisors (see below), whose sum is σ = 47331648. Its totient is φ = 6674400.

The previous prime is 20543689. The next prime is 20543711. The reversal of 20543706 is 60734502.

It is a happy number.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 20543706.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19411 + ... + 20441.

It is an arithmetic number, because the mean of its divisors is an integer number (986076).

Almost surely, 2^20543706 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20543706, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23665824).

20543706 is an abundant number, since it is smaller than the sum of its proper divisors (26787942).

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

20543706 is a wasteful number, since it uses less digits than its factorization.

20543706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1089 (or 1077 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 20543706 is about 4532.5165195507. The cubic root of 20543706 is about 273.8795446167.

The spelling of 20543706 in words is "twenty million, five hundred forty-three thousand, seven hundred six".