20543796 has 72 divisors (see below), whose sum is σ = 63924224. Its totient is φ = 5417280.

The previous prime is 20543777. The next prime is 20543801. The reversal of 20543796 is 69734502.

20543796 is a `hidden beast` number, since 20 + 543 + 7 + 96 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20543796.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 141 + ... + 6411.

Almost surely, 2^20543796 is an apocalyptic number.

20543796 is a gapful number since it is divisible by the number (26) 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 20543796, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31962112).

20543796 is an abundant number, since it is smaller than the sum of its proper divisors (43380428).

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

20543796 is a wasteful number, since it uses less digits than its factorization.

20543796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6301 (or 6296 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 20543796 is about 4532.5264477993. The cubic root of 20543796 is about 273.8799445628.

The spelling of 20543796 in words is "twenty million, five hundred forty-three thousand, seven hundred ninety-six".