20098777 has 4 divisors (see below), whose sum is σ = 21281076. Its totient is φ = 18916480.

The previous prime is 20098753. The next prime is 20098817. The reversal of 20098777 is 77789002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18071001 + 2027776 = 4251^2 + 1424^2 .

It is a cyclic number.

It is not a de Polignac number, because 20098777 - 2¹⁵ = 20066009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20098717) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 591124 + ... + 591157.

It is an arithmetic number, because the mean of its divisors is an integer number (5320269).

Almost surely, 2^20098777 is an apocalyptic number.

It is an amenable number.

20098777 is a deficient number, since it is larger than the sum of its proper divisors (1182299).

20098777 is a wasteful number, since it uses less digits than its factorization.

20098777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1182298.

The product of its (nonzero) digits is 49392, while the sum is 40.

The square root of 20098777 is about 4483.1659572226. The cubic root of 20098777 is about 271.8878980449.

The spelling of 20098777 in words is "twenty million, ninety-eight thousand, seven hundred seventy-seven".