20543004 has 96 divisors (see below), whose sum is σ = 57576960. Its totient is φ = 6310656.

The previous prime is 20542999. The next prime is 20543051. The reversal of 20543004 is 40034502.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

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 31 ways as a sum of consecutive naturals, for example, 122929 + ... + 123095.

It is an arithmetic number, because the mean of its divisors is an integer number (599760).

Almost surely, 2^20543004 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20543004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28788480).

20543004 is an abundant number, since it is smaller than the sum of its proper divisors (37033956).

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

20543004 is a wasteful number, since it uses less digits than its factorization.

20543004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264 (or 256 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 20543004 is about 4532.4390784654. The cubic root of 20543004 is about 273.8764249974.

Adding to 20543004 its reverse (40034502), we get a palindrome (60577506).

The spelling of 20543004 in words is "twenty million, five hundred forty-three thousand, four".