20298528809 has 16 divisors (see below), whose sum is σ = 21919468032. Its totient is φ = 18686179008.

The previous prime is 20298528791. The next prime is 20298528841. The reversal of 20298528809 is 90882589202.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20298528809 - 2¹² = 20298524713 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20298528889) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12822032 + ... + 12823614.

It is an arithmetic number, because the mean of its divisors is an integer number (1369966752).

Almost surely, 2^20298528809 is an apocalyptic number.

It is an amenable number.

20298528809 is a deficient number, since it is larger than the sum of its proper divisors (1620939223).

20298528809 is a wasteful number, since it uses less digits than its factorization.

20298528809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3656.

The product of its (nonzero) digits is 1658880, while the sum is 53.

The spelling of 20298528809 in words is "twenty billion, two hundred ninety-eight million, five hundred twenty-eight thousand, eight hundred nine".