20688001 has 2 divisors, whose sum is σ = 20688002. Its totient is φ = 20688000.

The previous prime is 20687993. The next prime is 20688007. The reversal of 20688001 is 10088602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20657025 + 30976 = 4545^2 + 176^2 .

It is a cyclic number.

It is not a de Polignac number, because 20688001 - 2³ = 20687993 is a prime.

It is not a weakly prime, because it can be changed into another prime (20688007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10344000 + 10344001.

It is an arithmetic number, because the mean of its divisors is an integer number (10344001).

Almost surely, 2^20688001 is an apocalyptic number.

It is an amenable number.

20688001 is a deficient number, since it is larger than the sum of its proper divisors (1).

20688001 is an equidigital number, since it uses as much as digits as its factorization.

20688001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 20688001 is about 4548.4064242326. The cubic root of 20688001 is about 274.5192747383.

The spelling of 20688001 in words is "twenty million, six hundred eighty-eight thousand, one".