20998093 has 2 divisors, whose sum is σ = 20998094. Its totient is φ = 20998092.

The previous prime is 20998069. The next prime is 20998139. The reversal of 20998093 is 39089902.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11744329 + 9253764 = 3427^2 + 3042^2 .

It is a cyclic number.

It is not a de Polignac number, because 20998093 - 2¹³ = 20989901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20998013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10499046 + 10499047.

It is an arithmetic number, because the mean of its divisors is an integer number (10499047).

Almost surely, 2^20998093 is an apocalyptic number.

It is an amenable number.

20998093 is a deficient number, since it is larger than the sum of its proper divisors (1).

20998093 is an equidigital number, since it uses as much as digits as its factorization.

20998093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 20998093 is about 4582.3676194736. The cubic root of 20998093 is about 275.8840661656.

The spelling of 20998093 in words is "twenty million, nine hundred ninety-eight thousand, ninety-three".