20898890 has 8 divisors (see below), whose sum is σ = 37618020. Its totient is φ = 8359552.

The previous prime is 20898887. The next prime is 20898901. The reversal of 20898890 is 9889802.

It can be written as a sum of positive squares in 2 ways, for example, as 17330569 + 3568321 = 4163^2 + 1889^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1044935 + ... + 1044954.

Almost surely, 2^20898890 is an apocalyptic number.

20898890 is a deficient number, since it is larger than the sum of its proper divisors (16719130).

20898890 is a wasteful number, since it uses less digits than its factorization.

20898890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2089896.

The product of its (nonzero) digits is 82944, while the sum is 44.

The square root of 20898890 is about 4571.5303783307. The cubic root of 20898890 is about 275.4489196616.

The spelling of 20898890 in words is "twenty million, eight hundred ninety-eight thousand, eight hundred ninety".