20863541 has 4 divisors (see below), whose sum is σ = 20916492. Its totient is φ = 20810592.

The previous prime is 20863537. The next prime is 20863543. The reversal of 20863541 is 14536802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16982641 + 3880900 = 4121^2 + 1970^2 .

It is a cyclic number.

It is not a de Polignac number, because 20863541 - 2² = 20863537 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 (20863543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25880 + ... + 26673.

It is an arithmetic number, because the mean of its divisors is an integer number (5229123).

Almost surely, 2^20863541 is an apocalyptic number.

It is an amenable number.

20863541 is a deficient number, since it is larger than the sum of its proper divisors (52951).

20863541 is an equidigital number, since it uses as much as digits as its factorization.

20863541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52950.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 20863541 is about 4567.6625313173. The cubic root of 20863541 is about 275.2935312055.

The spelling of 20863541 in words is "twenty million, eight hundred sixty-three thousand, five hundred forty-one".