20998370 has 8 divisors (see below), whose sum is σ = 37797084. Its totient is φ = 8399344.

The previous prime is 20998303. The next prime is 20998387. The reversal of 20998370 is 7389902.

It can be written as a sum of positive squares in 2 ways, for example, as 20894041 + 104329 = 4571^2 + 323^2 .

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

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, 1049909 + ... + 1049928.

Almost surely, 2^20998370 is an apocalyptic number.

20998370 is a deficient number, since it is larger than the sum of its proper divisors (16798714).

20998370 is a wasteful number, since it uses less digits than its factorization.

20998370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2099844.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 20998370 is about 4582.3978439241. The cubic root of 20998370 is about 275.8852792845.

The spelling of 20998370 in words is "twenty million, nine hundred ninety-eight thousand, three hundred seventy".