20603601 has 12 divisors (see below), whose sum is σ = 30787380. Its totient is φ = 13261920.

The previous prime is 20603563. The next prime is 20603603. The reversal of 20603601 is 10630602.

It is a happy number.

20603601 is a `hidden beast` number, since 2 + 0 + 60 + 3 + 601 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6765201 + 13838400 = 2601^2 + 3720^2 .

It is not a de Polignac number, because 20603601 - 2¹⁰ = 20602577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20603603) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39210 + ... + 39731.

It is an arithmetic number, because the mean of its divisors is an integer number (2565615).

Almost surely, 2^20603601 is an apocalyptic number.

It is an amenable number.

20603601 is a deficient number, since it is larger than the sum of its proper divisors (10183779).

20603601 is a wasteful number, since it uses less digits than its factorization.

20603601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78976 (or 78973 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 20603601 is about 4539.1189673768. The cubic root of 20603601 is about 274.1454508619.

The spelling of 20603601 in words is "twenty million, six hundred three thousand, six hundred one".