20459797 has 2 divisors, whose sum is σ = 20459798. Its totient is φ = 20459796.

The previous prime is 20459773. The next prime is 20459801. The reversal of 20459797 is 79795402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15256836 + 5202961 = 3906^2 + 2281^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20459797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20459707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10229898 + 10229899.

It is an arithmetic number, because the mean of its divisors is an integer number (10229899).

Almost surely, 2^20459797 is an apocalyptic number.

20459797 is the 2612-nd hex number.

It is an amenable number.

20459797 is a deficient number, since it is larger than the sum of its proper divisors (1).

20459797 is an equidigital number, since it uses as much as digits as its factorization.

20459797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 158760, while the sum is 43.

The square root of 20459797 is about 4523.2507116011. The cubic root of 20459797 is about 273.5061566504.

The spelling of 20459797 in words is "twenty million, four hundred fifty-nine thousand, seven hundred ninety-seven".