20712331 has 2 divisors, whose sum is σ = 20712332. Its totient is φ = 20712330.

The previous prime is 20712323. The next prime is 20712343. The reversal of 20712331 is 13321702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20712331 - 2³ = 20712323 is a prime.

It is a super-3 number, since 3×20712331³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 20712299 and 20712308.

It is not a weakly prime, because it can be changed into another prime (20712301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10356165 + 10356166.

It is an arithmetic number, because the mean of its divisors is an integer number (10356166).

Almost surely, 2^20712331 is an apocalyptic number.

20712331 is a deficient number, since it is larger than the sum of its proper divisors (1).

20712331 is an equidigital number, since it uses as much as digits as its factorization.

20712331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 20712331 is about 4551.0802014467. The cubic root of 20712331 is about 274.6268481634.

The spelling of 20712331 in words is "twenty million, seven hundred twelve thousand, three hundred thirty-one".