20541603 has 16 divisors (see below), whose sum is σ = 28926720. Its totient is φ = 12930336.

The previous prime is 20541601. The next prime is 20541607. The reversal of 20541603 is 30614502.

It is a happy number.

It is not a de Polignac number, because 20541603 - 2¹ = 20541601 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20541603.

It is not an unprimeable number, because it can be changed into a prime (20541601) 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, 31426 + ... + 32072.

It is an arithmetic number, because the mean of its divisors is an integer number (1807920).

Almost surely, 2^20541603 is an apocalyptic number.

20541603 is a deficient number, since it is larger than the sum of its proper divisors (8385117).

20541603 is a wasteful number, since it uses less digits than its factorization.

20541603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1226.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 20541603 is about 4532.2845232840. The cubic root of 20541603 is about 273.8701988778.

The spelling of 20541603 in words is "twenty million, five hundred forty-one thousand, six hundred three".