20498857 has 2 divisors, whose sum is σ = 20498858. Its totient is φ = 20498856.

The previous prime is 20498833. The next prime is 20498869. The reversal of 20498857 is 75889402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11861136 + 8637721 = 3444^2 + 2939^2 .

It is a cyclic number.

It is not a de Polignac number, because 20498857 - 2²³ = 12110249 is a prime.

It is not a weakly prime, because it can be changed into another prime (20498827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10249428 + 10249429.

It is an arithmetic number, because the mean of its divisors is an integer number (10249429).

Almost surely, 2^20498857 is an apocalyptic number.

It is an amenable number.

20498857 is a deficient number, since it is larger than the sum of its proper divisors (1).

20498857 is an equidigital number, since it uses as much as digits as its factorization.

20498857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 161280, while the sum is 43.

The square root of 20498857 is about 4527.5663440749. The cubic root of 20498857 is about 273.6800971061.

The spelling of 20498857 in words is "twenty million, four hundred ninety-eight thousand, eight hundred fifty-seven".