20869760 has 32 divisors (see below), whose sum is σ = 49893300. Its totient is φ = 8347648.

The previous prime is 20869721. The next prime is 20869781. The reversal of 20869760 is 6796802.

It can be written as a sum of positive squares in 2 ways, for example, as 20866624 + 3136 = 4568^2 + 56^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15665 + ... + 16944.

Almost surely, 2^20869760 is an apocalyptic number.

20869760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20869760 is an abundant number, since it is smaller than the sum of its proper divisors (29023540).

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

20869760 is an equidigital number, since it uses as much as digits as its factorization.

20869760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32628 (or 32616 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 20869760 is about 4568.3432445472. The cubic root of 20869760 is about 275.3208816345.

The spelling of 20869760 in words is "twenty million, eight hundred sixty-nine thousand, seven hundred sixty".