20864488 has 16 divisors (see below), whose sum is σ = 40383360. Its totient is φ = 10095600.

The previous prime is 20864483. The next prime is 20864507. The reversal of 20864488 is 88446802.

It is a super-5 number, since 5×20864488⁵ (a number of 38 digits) contains 55555 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20864488.

It is not an unprimeable number, because it can be changed into a prime (20864483) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41818 + ... + 42313.

It is an arithmetic number, because the mean of its divisors is an integer number (2523960).

Almost surely, 2^20864488 is an apocalyptic number.

It is an amenable number.

20864488 is a deficient number, since it is larger than the sum of its proper divisors (19518872).

20864488 is a wasteful number, since it uses less digits than its factorization.

20864488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84168 (or 84164 counting only the distinct ones).

The product of its (nonzero) digits is 98304, while the sum is 40.

The square root of 20864488 is about 4567.7661936662. The cubic root of 20864488 is about 275.2976963506.

The spelling of 20864488 in words is "twenty million, eight hundred sixty-four thousand, four hundred eighty-eight".