20013436 has 24 divisors (see below), whose sum is σ = 36242640. Its totient is φ = 9664512.

The previous prime is 20013421. The next prime is 20013439. The reversal of 20013436 is 63431002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20013439) 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, 13500 + ... + 14908.

It is an arithmetic number, because the mean of its divisors is an integer number (1510110).

Almost surely, 2^20013436 is an apocalyptic number.

It is an amenable number.

20013436 is a deficient number, since it is larger than the sum of its proper divisors (16229204).

20013436 is a wasteful number, since it uses less digits than its factorization.

20013436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1533 (or 1531 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 20013436 is about 4473.6378932587. The cubic root of 20013436 is about 271.5025329113.

Adding to 20013436 its reverse (63431002), we get a palindrome (83444438).

It can be divided in two parts, 20013 and 436, that added together give a square (20449 = 143²).

The spelling of 20013436 in words is "twenty million, thirteen thousand, four hundred thirty-six".