20540436 has 24 divisors (see below), whose sum is σ = 54774720. Its totient is φ = 5868672.

The previous prime is 20540431. The next prime is 20540441. The reversal of 20540436 is 63404502.

It is an interprime number because it is at equal distance from previous prime (20540431) and next prime (20540441).

It is a super-2 number, since 2×20540436² = 843819022140192, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20540431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122181 + ... + 122348.

It is an arithmetic number, because the mean of its divisors is an integer number (2282280).

Almost surely, 2^20540436 is an apocalyptic number.

It is an amenable number.

20540436 is an abundant number, since it is smaller than the sum of its proper divisors (34234284).

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

20540436 is a wasteful number, since it uses less digits than its factorization.

20540436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244543 (or 244541 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 20540436 is about 4532.1557784348. The cubic root of 20540436 is about 273.8650124508.

Adding to 20540436 its reverse (63404502), we get a palindrome (83944938).

The spelling of 20540436 in words is "twenty million, five hundred forty thousand, four hundred thirty-six".