20969288 has 12 divisors (see below), whose sum is σ = 39341715. Its totient is φ = 10478168.

The previous prime is 20969281. The next prime is 20969303. The reversal of 20969288 is 88296902.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 10484644 + 10484644 = 3238^2 + 3238^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=3238.

It is a super-2 number, since 2×20969288² = 879422078453888, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20969281) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 12143 + ... + 13761.

Almost surely, 2^20969288 is an apocalyptic number.

It is an amenable number.

20969288 is a deficient number, since it is larger than the sum of its proper divisors (18372427).

20969288 is an frugal number, since it uses more digits than its factorization.

20969288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3244 (or 1621 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 20969288 is about 4579.2235149641. The cubic root of 20969288 is about 275.7578566554.

The spelling of 20969288 in words is "twenty million, nine hundred sixty-nine thousand, two hundred eighty-eight".