20783887 has 2 divisors, whose sum is σ = 20783888. Its totient is φ = 20783886.

The previous prime is 20783879. The next prime is 20783941. The reversal of 20783887 is 78838702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20783887 - 2³ = 20783879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20783827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10391943 + 10391944.

It is an arithmetic number, because the mean of its divisors is an integer number (10391944).

Almost surely, 2^20783887 is an apocalyptic number.

20783887 is a deficient number, since it is larger than the sum of its proper divisors (1).

20783887 is an equidigital number, since it uses as much as digits as its factorization.

20783887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 150528, while the sum is 43.

The square root of 20783887 is about 4558.9348536692. The cubic root of 20783887 is about 274.9427406956.

The spelling of 20783887 in words is "twenty million, seven hundred eighty-three thousand, eight hundred eighty-seven".