20969136 has 60 divisors (see below), whose sum is σ = 59037888. Its totient is φ = 6947712.

The previous prime is 20969129. The next prime is 20969147. The reversal of 20969136 is 63196902.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20969136.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31786 + ... + 32438.

Almost surely, 2^20969136 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 20969136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29518944).

20969136 is an abundant number, since it is smaller than the sum of its proper divisors (38068752).

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

20969136 is a wasteful number, since it uses less digits than its factorization.

20969136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890 (or 881 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 20969136 is about 4579.2069182338. The cubic root of 20969136 is about 275.7571903588.

The spelling of 20969136 in words is "twenty million, nine hundred sixty-nine thousand, one hundred thirty-six".