20877047 has 2 divisors, whose sum is σ = 20877048. Its totient is φ = 20877046.

The previous prime is 20877011. The next prime is 20877061. The reversal of 20877047 is 74077802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20877047 - 2¹⁸ = 20614903 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20876998 and 20877016.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20877247) 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, 10438523 + 10438524.

It is an arithmetic number, because the mean of its divisors is an integer number (10438524).

Almost surely, 2^20877047 is an apocalyptic number.

20877047 is a deficient number, since it is larger than the sum of its proper divisors (1).

20877047 is an equidigital number, since it uses as much as digits as its factorization.

20877047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21952, while the sum is 35.

The square root of 20877047 is about 4569.1407288461. The cubic root of 20877047 is about 275.3529220892.

The spelling of 20877047 in words is "twenty million, eight hundred seventy-seven thousand, forty-seven".