20870899 has 8 divisors (see below), whose sum is σ = 23931648. Its totient is φ = 17829960.

The previous prime is 20870887. The next prime is 20870909. The reversal of 20870899 is 99807802.

20870899 = 88² + 89² + ... + 398².

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

It is a cyclic number.

It is not a de Polignac number, because 20870899 - 2¹³ = 20862707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20870869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2617 + ... + 6970.

It is an arithmetic number, because the mean of its divisors is an integer number (2991456).

Almost surely, 2^20870899 is an apocalyptic number.

20870899 is a deficient number, since it is larger than the sum of its proper divisors (3060749).

20870899 is an equidigital number, since it uses as much as digits as its factorization.

20870899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9905.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 20870899 is about 4568.4679051078. The cubic root of 20870899 is about 275.3258902335.

The spelling of 20870899 in words is "twenty million, eight hundred seventy thousand, eight hundred ninety-nine".