20916080 has 20 divisors (see below), whose sum is σ = 48630072. Its totient is φ = 8366400.

The previous prime is 20916073. The next prime is 20916089. The reversal of 20916080 is 8061902.

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20916089) 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, 130646 + ... + 130805.

Almost surely, 2^20916080 is an apocalyptic number.

20916080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20916080 is an abundant number, since it is smaller than the sum of its proper divisors (27713992).

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

20916080 is a wasteful number, since it uses less digits than its factorization.

20916080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261464 (or 261458 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 20916080 is about 4573.4101062555. The cubic root of 20916080 is about 275.5244207895.

Adding to 20916080 its reverse (8061902), we get a palindrome (28977982).

The spelling of 20916080 in words is "twenty million, nine hundred sixteen thousand, eighty".