20673601 has 12 divisors (see below), whose sum is σ = 22563900. Its totient is φ = 18932160.

The previous prime is 20673599. The next prime is 20673613. The reversal of 20673601 is 10637602.

It can be written as a sum of positive squares in 6 ways, for example, as 9120400 + 11553201 = 3020^2 + 3399^2 .

It is not a de Polignac number, because 20673601 - 2¹ = 20673599 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 (20673671) 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, 24771 + ... + 25591.

It is an arithmetic number, because the mean of its divisors is an integer number (1880325).

Almost surely, 2^20673601 is an apocalyptic number.

It is an amenable number.

20673601 is a deficient number, since it is larger than the sum of its proper divisors (1890299).

20673601 is a wasteful number, since it uses less digits than its factorization.

20673601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 996 (or 983 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 20673601 is about 4546.8231766806. The cubic root of 20673601 is about 274.4555663904.

The spelling of 20673601 in words is "twenty million, six hundred seventy-three thousand, six hundred one".