20028520601 has 4 divisors (see below), whose sum is σ = 20091702372. Its totient is φ = 19965338832.

The previous prime is 20028520571. The next prime is 20028520613. The reversal of 20028520601 is 10602582002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10602582002 = 2 ⋅5301291001.

It can be written as a sum of positive squares in 2 ways, for example, as 1293481225 + 18735039376 = 35965^2 + 136876^2 .

It is a cyclic number.

It is not a de Polignac number, because 20028520601 - 2⁶ = 20028520537 is a prime.

It is a super-2 number, since 2×20028520601² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20028520651) 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, 31590410 + ... + 31591043.

It is an arithmetic number, because the mean of its divisors is an integer number (5022925593).

Almost surely, 2^20028520601 is an apocalyptic number.

It is an amenable number.

20028520601 is a deficient number, since it is larger than the sum of its proper divisors (63181771).

20028520601 is an equidigital number, since it uses as much as digits as its factorization.

20028520601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63181770.

The product of its (nonzero) digits is 1920, while the sum is 26.

The spelling of 20028520601 in words is "twenty billion, twenty-eight million, five hundred twenty thousand, six hundred one".