20356398 has 36 divisors (see below), whose sum is σ = 45767904. Its totient is φ = 6532200.

The previous prime is 20356397. The next prime is 20356421. The reversal of 20356398 is 89365302.

20356398 is a `hidden beast` number, since 2 + 0 + 3 + 563 + 98 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20356393) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 106483 + ... + 106673.

Almost surely, 2^20356398 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20356398, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22883952).

20356398 is an abundant number, since it is smaller than the sum of its proper divisors (25411506).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20356398 is a wasteful number, since it uses less digits than its factorization.

20356398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421 (or 227 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 20356398 is about 4511.8065118088. The cubic root of 20356398 is about 273.0446330438.

The spelling of 20356398 in words is "twenty million, three hundred fifty-six thousand, three hundred ninety-eight".