20869776 has 60 divisors (see below), whose sum is σ = 60000252. Its totient is φ = 6766848.

The previous prime is 20869721. The next prime is 20869781. The reversal of 20869776 is 67796802.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17842176 + 3027600 = 4224^2 + 1740^2 .

It is a congruent number.

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, 3370 + ... + 7286.

Almost surely, 2^20869776 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 20869776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30000126).

20869776 is an abundant number, since it is smaller than the sum of its proper divisors (39130476).

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

20869776 is a wasteful number, since it uses less digits than its factorization.

20869776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3968 (or 3959 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The square root of 20869776 is about 4568.3449957288. The cubic root of 20869776 is about 275.3209519936.

The spelling of 20869776 in words is "twenty million, eight hundred sixty-nine thousand, seven hundred seventy-six".