20798501 has 2 divisors, whose sum is σ = 20798502. Its totient is φ = 20798500.

The previous prime is 20798473. The next prime is 20798507. The reversal of 20798501 is 10589702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20160100 + 638401 = 4490^2 + 799^2 .

It is a cyclic number.

It is not a de Polignac number, because 20798501 - 2¹⁴ = 20782117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20798507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10399250 + 10399251.

It is an arithmetic number, because the mean of its divisors is an integer number (10399251).

Almost surely, 2^20798501 is an apocalyptic number.

It is an amenable number.

20798501 is a deficient number, since it is larger than the sum of its proper divisors (1).

20798501 is an equidigital number, since it uses as much as digits as its factorization.

20798501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 20798501 is about 4560.5373586892. The cubic root of 20798501 is about 275.0071667554.

The spelling of 20798501 in words is "twenty million, seven hundred ninety-eight thousand, five hundred one".