20398545 has 12 divisors (see below), whose sum is σ = 35357556. Its totient is φ = 10879200.

The previous prime is 20398531. The next prime is 20398561. The reversal of 20398545 is 54589302.

20398545 is a `hidden beast` number, since 20 + 3 + 98 + 545 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8225424 + 12173121 = 2868^2 + 3489^2 .

It is not a de Polignac number, because 20398545 - 2⁴ = 20398529 is a prime.

It is a super-2 number, since 2×20398545² = 832201276234050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 226606 + ... + 226695.

It is an arithmetic number, because the mean of its divisors is an integer number (2946463).

Almost surely, 2^20398545 is an apocalyptic number.

It is an amenable number.

20398545 is a deficient number, since it is larger than the sum of its proper divisors (14959011).

20398545 is a wasteful number, since it uses less digits than its factorization.

20398545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453312 (or 453309 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 20398545 is about 4516.4748421750. The cubic root of 20398545 is about 273.2329453212.

The spelling of 20398545 in words is "twenty million, three hundred ninety-eight thousand, five hundred forty-five".