20611863 has 6 divisors (see below), whose sum is σ = 29772704. Its totient is φ = 13741236.

The previous prime is 20611861. The next prime is 20611873. The reversal of 20611863 is 36811602.

It is not a de Polignac number, because 20611863 - 2¹ = 20611861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20611861) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1145095 + ... + 1145112.

Almost surely, 2^20611863 is an apocalyptic number.

20611863 is a deficient number, since it is larger than the sum of its proper divisors (9160841).

20611863 is a wasteful number, since it uses less digits than its factorization.

20611863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2290213 (or 2290210 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 20611863 is about 4540.0289646653. The cubic root of 20611863 is about 274.1820898784.

The spelling of 20611863 in words is "twenty million, six hundred eleven thousand, eight hundred sixty-three".