20543402 has 16 divisors (see below), whose sum is σ = 33741792. Its totient is φ = 9303120.

The previous prime is 20543401. The next prime is 20543417. The reversal of 20543402 is 20434502.

It is not an unprimeable number, because it can be changed into a prime (20543401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4853 + ... + 8039.

It is an arithmetic number, because the mean of its divisors is an integer number (2108862).

Almost surely, 2^20543402 is an apocalyptic number.

20543402 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20543402 is a deficient number, since it is larger than the sum of its proper divisors (13198390).

20543402 is a wasteful number, since it uses less digits than its factorization.

20543402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3493.

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 20543402 is about 4532.4829839725. The cubic root of 20543402 is about 273.8781936792.

Adding to 20543402 its reverse (20434502), we get a palindrome (40977904).

Subtracting from 20543402 its reverse (20434502), we obtain a square (108900 = 330²).

The spelling of 20543402 in words is "twenty million, five hundred forty-three thousand, four hundred two".