20712823 has 2 divisors, whose sum is σ = 20712824. Its totient is φ = 20712822.

The previous prime is 20712767. The next prime is 20712829. The reversal of 20712823 is 32821702.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20712823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20712829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10356411 + 10356412.

It is an arithmetic number, because the mean of its divisors is an integer number (10356412).

Almost surely, 2^20712823 is an apocalyptic number.

20712823 is a deficient number, since it is larger than the sum of its proper divisors (1).

20712823 is an equidigital number, since it uses as much as digits as its factorization.

20712823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 20712823 is about 4551.1342542272. The cubic root of 20712823 is about 274.6290226384.

The spelling of 20712823 in words is "twenty million, seven hundred twelve thousand, eight hundred twenty-three".