20726471 has 2 divisors, whose sum is σ = 20726472. Its totient is φ = 20726470.

The previous prime is 20726441. The next prime is 20726477. The reversal of 20726471 is 17462702.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20726471 is a prime.

It is a super-3 number, since 3×20726471³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20726477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10363235 + 10363236.

It is an arithmetic number, because the mean of its divisors is an integer number (10363236).

Almost surely, 2^20726471 is an apocalyptic number.

20726471 is a deficient number, since it is larger than the sum of its proper divisors (1).

20726471 is an equidigital number, since it uses as much as digits as its factorization.

20726471 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 20726471 is about 4552.6334137508. The cubic root of 20726471 is about 274.6893285009.

The spelling of 20726471 in words is "twenty million, seven hundred twenty-six thousand, four hundred seventy-one".