20858761 has 12 divisors (see below), whose sum is σ = 26470800. Its totient is φ = 16253160.

The previous prime is 20858759. The next prime is 20858771. The reversal of 20858761 is 16785802.

It is not a de Polignac number, because 20858761 - 2¹ = 20858759 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20858761.

It is not an unprimeable number, because it can be changed into a prime (20858701) 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 in 11 ways as a sum of consecutive naturals, for example, 18811 + ... + 19888.

It is an arithmetic number, because the mean of its divisors is an integer number (2205900).

Almost surely, 2^20858761 is an apocalyptic number.

It is an amenable number.

20858761 is a deficient number, since it is larger than the sum of its proper divisors (5612039).

20858761 is a wasteful number, since it uses less digits than its factorization.

20858761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38724 (or 38717 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 20858761 is about 4567.1392577849. The cubic root of 20858761 is about 275.2725056345.

The spelling of 20858761 in words is "twenty million, eight hundred fifty-eight thousand, seven hundred sixty-one".