20967487 has 2 divisors, whose sum is σ = 20967488. Its totient is φ = 20967486.

The previous prime is 20967473. The next prime is 20967497. The reversal of 20967487 is 78476902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20967487 - 2²³ = 12578879 is a prime.

It is a super-2 number, since 2×20967487² = 879271022190338, which contains 22 as substring.

It is a zygodrome in base 8.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20967497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10483743 + 10483744.

It is an arithmetic number, because the mean of its divisors is an integer number (10483744).

Almost surely, 2^20967487 is an apocalyptic number.

20967487 is a deficient number, since it is larger than the sum of its proper divisors (1).

20967487 is an equidigital number, since it uses as much as digits as its factorization.

20967487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 169344, while the sum is 43.

The square root of 20967487 is about 4579.0268616814. The cubic root of 20967487 is about 275.7499617105.

The spelling of 20967487 in words is "twenty million, nine hundred sixty-seven thousand, four hundred eighty-seven".