20712056 has 8 divisors (see below), whose sum is σ = 38835120. Its totient is φ = 10356024.

The previous prime is 20712053. The next prime is 20712059. The reversal of 20712056 is 65021702.

It is an interprime number because it is at equal distance from previous prime (20712053) and next prime (20712059).

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20712053) 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 as a sum of consecutive naturals, namely, 1294496 + ... + 1294511.

It is an arithmetic number, because the mean of its divisors is an integer number (4854390).

Almost surely, 2^20712056 is an apocalyptic number.

It is an amenable number.

20712056 is a deficient number, since it is larger than the sum of its proper divisors (18123064).

20712056 is a wasteful number, since it uses less digits than its factorization.

20712056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2589013 (or 2589009 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 20712056 is about 4551.0499887389. The cubic root of 20712056 is about 274.6256327406.

Adding to 20712056 its reverse (65021702), we get a palindrome (85733758).

The spelling of 20712056 in words is "twenty million, seven hundred twelve thousand, fifty-six".