20684198 has 16 divisors (see below), whose sum is σ = 32955120. Its totient is φ = 9709056.

The previous prime is 20684197. The next prime is 20684203. The reversal of 20684198 is 89148602.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20684197) 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, 1886 + ... + 6702.

It is an arithmetic number, because the mean of its divisors is an integer number (2059695).

Almost surely, 2^20684198 is an apocalyptic number.

20684198 is a deficient number, since it is larger than the sum of its proper divisors (12270922).

20684198 is a wasteful number, since it uses less digits than its factorization.

20684198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4951.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 20684198 is about 4547.9883465110. The cubic root of 20684198 is about 274.5024524141.

The spelling of 20684198 in words is "twenty million, six hundred eighty-four thousand, one hundred ninety-eight".