20289708 has 36 divisors (see below), whose sum is σ = 51459408. Its totient is φ = 6740640.

The previous prime is 20289707. The next prime is 20289713. The reversal of 20289708 is 80798202.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (20289707) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12673 + ... + 14183.

It is an arithmetic number, because the mean of its divisors is an integer number (1429428).

Almost surely, 2^20289708 is an apocalyptic number.

It is an amenable number.

20289708 is an abundant number, since it is smaller than the sum of its proper divisors (31169700).

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

20289708 is a wasteful number, since it uses less digits than its factorization.

20289708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1894 (or 1889 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 20289708 is about 4504.4098392575. The cubic root of 20289708 is about 272.7461311808.

The spelling of 20289708 in words is "twenty million, two hundred eighty-nine thousand, seven hundred eight".