20897898 has 32 divisors (see below), whose sum is σ = 48048000. Its totient is φ = 5935680.

The previous prime is 20897873. The next prime is 20897909. The reversal of 20897898 is 89879802.

It is a self number, because there is not a number n which added to its sum of digits gives 20897898.

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 15 ways as a sum of consecutive naturals, for example, 6228 + ... + 8976.

It is an arithmetic number, because the mean of its divisors is an integer number (1501500).

Almost surely, 2^20897898 is an apocalyptic number.

20897898 is an abundant number, since it is smaller than the sum of its proper divisors (27150102).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20897898 is a wasteful number, since it uses less digits than its factorization.

20897898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2942.

The product of its (nonzero) digits is 580608, while the sum is 51.

The square root of 20897898 is about 4571.4218794594. The cubic root of 20897898 is about 275.4445613814. Note that the first 3 decimals are identical.

The spelling of 20897898 in words is "twenty million, eight hundred ninety-seven thousand, eight hundred ninety-eight".