20591361 has 16 divisors (see below), whose sum is σ = 34864000. Its totient is φ = 11766384.

The previous prime is 20591359. The next prime is 20591377. The reversal of 20591361 is 16319502.

It is not a de Polignac number, because 20591361 - 2¹ = 20591359 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20591341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54286 + ... + 54663.

It is an arithmetic number, because the mean of its divisors is an integer number (2179000).

Almost surely, 2^20591361 is an apocalyptic number.

20591361 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20591361 is a deficient number, since it is larger than the sum of its proper divisors (14272639).

20591361 is a wasteful number, since it uses less digits than its factorization.

20591361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108965 (or 108959 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 20591361 is about 4537.7704878057. The cubic root of 20591361 is about 274.0911528290.

The spelling of 20591361 in words is "twenty million, five hundred ninety-one thousand, three hundred sixty-one".