20673487 has 2 divisors, whose sum is σ = 20673488. Its totient is φ = 20673486.

The previous prime is 20673469. The next prime is 20673509. The reversal of 20673487 is 78437602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20673487 - 2²³ = 12284879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20673427) 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, 10336743 + 10336744.

It is an arithmetic number, because the mean of its divisors is an integer number (10336744).

Almost surely, 2^20673487 is an apocalyptic number.

20673487 is a deficient number, since it is larger than the sum of its proper divisors (1).

20673487 is an equidigital number, since it uses as much as digits as its factorization.

20673487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 20673487 is about 4546.8106404380. The cubic root of 20673487 is about 274.4550619146.

The spelling of 20673487 in words is "twenty million, six hundred seventy-three thousand, four hundred eighty-seven".