20459801 has 2 divisors, whose sum is σ = 20459802. Its totient is φ = 20459800.

The previous prime is 20459797. The next prime is 20459809. The reversal of 20459801 is 10895402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18284176 + 2175625 = 4276^2 + 1475^2 .

It is a cyclic number.

It is not a de Polignac number, because 20459801 - 2² = 20459797 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20459809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10229900 + 10229901.

It is an arithmetic number, because the mean of its divisors is an integer number (10229901).

Almost surely, 2^20459801 is an apocalyptic number.

It is an amenable number.

20459801 is a deficient number, since it is larger than the sum of its proper divisors (1).

20459801 is an equidigital number, since it uses as much as digits as its factorization.

20459801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 20459801 is about 4523.2511537610. The cubic root of 20459801 is about 273.5061744743.

The spelling of 20459801 in words is "twenty million, four hundred fifty-nine thousand, eight hundred one".