20398641 has 8 divisors (see below), whose sum is σ = 27830880. Its totient is φ = 13282752.

The previous prime is 20398627. The next prime is 20398643. The reversal of 20398641 is 14689302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20398641 - 2⁶ = 20398577 is a prime.

It is a super-2 number, since 2×20398641² = 832209109293762, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20398643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78936 + ... + 79193.

It is an arithmetic number, because the mean of its divisors is an integer number (3478860).

Almost surely, 2^20398641 is an apocalyptic number.

It is an amenable number.

20398641 is a deficient number, since it is larger than the sum of its proper divisors (7432239).

20398641 is a wasteful number, since it uses less digits than its factorization.

20398641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158175.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 20398641 is about 4516.4854699202. The cubic root of 20398641 is about 273.2333739518.

The spelling of 20398641 in words is "twenty million, three hundred ninety-eight thousand, six hundred forty-one".