20677471 has 2 divisors, whose sum is σ = 20677472. Its totient is φ = 20677470.

The previous prime is 20677463. The next prime is 20677477. The reversal of 20677471 is 17477602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20677471 - 2³ = 20677463 is a prime.

It is a super-3 number, since 3×20677471³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20677477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10338735 + 10338736.

It is an arithmetic number, because the mean of its divisors is an integer number (10338736).

Almost surely, 2^20677471 is an apocalyptic number.

20677471 is a deficient number, since it is larger than the sum of its proper divisors (1).

20677471 is an equidigital number, since it uses as much as digits as its factorization.

20677471 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16464, while the sum is 34.

The square root of 20677471 is about 4547.2487286270. The cubic root of 20677471 is about 274.4726909151.

It can be divided in two parts, 206 and 77471, that added together give a palindrome (77677).

The spelling of 20677471 in words is "twenty million, six hundred seventy-seven thousand, four hundred seventy-one".