20969472 has 48 divisors (see below), whose sum is σ = 55921320. Its totient is φ = 6987776.

The previous prime is 20969471. The next prime is 20969489. The reversal of 20969472 is 27496902.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 20969472.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20969471) 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, 4438 + ... + 7850.

Almost surely, 2^20969472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20969472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27960660).

20969472 is an abundant number, since it is smaller than the sum of its proper divisors (34951848).

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

20969472 is an equidigital number, since it uses as much as digits as its factorization.

20969472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3438 (or 3418 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 39.

The square root of 20969472 is about 4579.2436056624. The cubic root of 20969472 is about 275.7586632206.

The spelling of 20969472 in words is "twenty million, nine hundred sixty-nine thousand, four hundred seventy-two".