20512601 has 4 divisors (see below), whose sum is σ = 20700900. Its totient is φ = 20324304.

The previous prime is 20512579. The next prime is 20512663. The reversal of 20512601 is 10621502.

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 8094025 + 12418576 = 2845^2 + 3524^2 .

It is a cyclic number.

It is not a de Polignac number, because 20512601 - 2¹⁰ = 20511577 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20512601.

It is not an unprimeable number, because it can be changed into a prime (20512691) 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, 93986 + ... + 94203.

It is an arithmetic number, because the mean of its divisors is an integer number (5175225).

Almost surely, 2^20512601 is an apocalyptic number.

It is an amenable number.

20512601 is a deficient number, since it is larger than the sum of its proper divisors (188299).

20512601 is a wasteful number, since it uses less digits than its factorization.

20512601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188298.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 20512601 is about 4529.0839029543. The cubic root of 20512601 is about 273.7412487907.

The spelling of 20512601 in words is "twenty million, five hundred twelve thousand, six hundred one".