20999098 has 4 divisors (see below), whose sum is σ = 31498650. Its totient is φ = 10499548.

The previous prime is 20999087. The next prime is 20999101. The reversal of 20999098 is 89099902.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15108769 + 5890329 = 3887^2 + 2427^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5249773 + ... + 5249776.

Almost surely, 2^20999098 is an apocalyptic number.

20999098 is a deficient number, since it is larger than the sum of its proper divisors (10499552).

20999098 is a wasteful number, since it uses less digits than its factorization.

20999098 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10499551.

The product of its (nonzero) digits is 104976, while the sum is 46.

The square root of 20999098 is about 4582.4772776305. The cubic root of 20999098 is about 275.8884675028. Note that the first 3 decimals are identical.

The spelling of 20999098 in words is "twenty million, nine hundred ninety-nine thousand, ninety-eight".