20713236 has 12 divisors (see below), whose sum is σ = 48330912. Its totient is φ = 6904408.

The previous prime is 20713219. The next prime is 20713243. The reversal of 20713236 is 63231702.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 863040 + ... + 863063.

It is an arithmetic number, because the mean of its divisors is an integer number (4027576).

Almost surely, 2^20713236 is an apocalyptic number.

It is an amenable number.

20713236 is an abundant number, since it is smaller than the sum of its proper divisors (27617676).

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

20713236 is a wasteful number, since it uses less digits than its factorization.

20713236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1726110 (or 1726108 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 24.

The square root of 20713236 is about 4551.1796273054. The cubic root of 20713236 is about 274.6308479333.

Adding to 20713236 its reverse (63231702), we get a palindrome (83944938).

The spelling of 20713236 in words is "twenty million, seven hundred thirteen thousand, two hundred thirty-six".