20197859 has 8 divisors (see below), whose sum is σ = 22336752. Its totient is φ = 18109440.

The previous prime is 20197843. The next prime is 20197861. The reversal of 20197859 is 95879102.

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

It is a cyclic number.

It is not a de Polignac number, because 20197859 - 2⁴ = 20197843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20197159) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11774 + ... + 13379.

It is an arithmetic number, because the mean of its divisors is an integer number (2792094).

Almost surely, 2^20197859 is an apocalyptic number.

20197859 is a deficient number, since it is larger than the sum of its proper divisors (2138893).

20197859 is a wasteful number, since it uses less digits than its factorization.

20197859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25237.

The product of its (nonzero) digits is 45360, while the sum is 41.

The square root of 20197859 is about 4494.2028214134. The cubic root of 20197859 is about 272.3339459097. Note that the first 3 decimals are identical.

The spelling of 20197859 in words is "twenty million, one hundred ninety-seven thousand, eight hundred fifty-nine".