20985802 has 8 divisors (see below), whose sum is σ = 31500000. Its totient is φ = 10485804.

The previous prime is 20985799. The next prime is 20985847. The reversal of 20985802 is 20858902.

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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1699 + ... + 6697.

It is an arithmetic number, because the mean of its divisors is an integer number (3937500).

Almost surely, 2^20985802 is an apocalyptic number.

20985802 is a deficient number, since it is larger than the sum of its proper divisors (10514198).

20985802 is a wasteful number, since it uses less digits than its factorization.

20985802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7100.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 20985802 is about 4581.0263042249. The cubic root of 20985802 is about 275.8302271038.

The spelling of 20985802 in words is "twenty million, nine hundred eighty-five thousand, eight hundred two".