20485807 has 2 divisors, whose sum is σ = 20485808. Its totient is φ = 20485806.

The previous prime is 20485789. The next prime is 20485837. The reversal of 20485807 is 70858402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20485807 - 2¹⁵ = 20453039 is a prime.

It is equal to p_1299391 and since 20485807 and 1299391 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20485837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10242903 + 10242904.

It is an arithmetic number, because the mean of its divisors is an integer number (10242904).

Almost surely, 2^20485807 is an apocalyptic number.

20485807 is a deficient number, since it is larger than the sum of its proper divisors (1).

20485807 is an equidigital number, since it uses as much as digits as its factorization.

20485807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 20485807 is about 4526.1249430390. The cubic root of 20485807 is about 273.6220079577.

The spelling of 20485807 in words is "twenty million, four hundred eighty-five thousand, eight hundred seven".