20861163 has 6 divisors (see below), whose sum is σ = 30132804. Its totient is φ = 13907436.

The previous prime is 20861143. The next prime is 20861167. The reversal of 20861163 is 36116802.

It is not a de Polignac number, because 20861163 - 2¹³ = 20852971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20861167) 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, 1158945 + ... + 1158962.

It is an arithmetic number, because the mean of its divisors is an integer number (5022134).

Almost surely, 2^20861163 is an apocalyptic number.

20861163 is a deficient number, since it is larger than the sum of its proper divisors (9271641).

20861163 is a wasteful number, since it uses less digits than its factorization.

20861163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2317913 (or 2317910 counting only the distinct ones).

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

The square root of 20861163 is about 4567.4022157021. The cubic root of 20861163 is about 275.2830716053.

Adding to 20861163 its reverse (36116802), we get a palindrome (56977965).

It can be divided in two parts, 2086 and 1163, that added together give a square (3249 = 57²).

The spelling of 20861163 in words is "twenty million, eight hundred sixty-one thousand, one hundred sixty-three".