20731198 has 8 divisors (see below), whose sum is σ = 31120200. Its totient is φ = 10357800.

The previous prime is 20731189. The next prime is 20731231. The reversal of 20731198 is 89113702.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 348 + ... + 6448.

It is an arithmetic number, because the mean of its divisors is an integer number (3890025).

Almost surely, 2^20731198 is an apocalyptic number.

20731198 is a deficient number, since it is larger than the sum of its proper divisors (10389002).

20731198 is a wasteful number, since it uses less digits than its factorization.

20731198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7802.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 20731198 is about 4553.1525342338. The cubic root of 20731198 is about 274.7102093310.

The spelling of 20731198 in words is "twenty million, seven hundred thirty-one thousand, one hundred ninety-eight".