20775280 has 20 divisors (see below), whose sum is σ = 48302712. Its totient is φ = 8310080.

The previous prime is 20775259. The next prime is 20775299. The reversal of 20775280 is 8257702.

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

It is a super-2 number, since 2×20775280² = 863224518156800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129766 + ... + 129925.

Almost surely, 2^20775280 is an apocalyptic number.

20775280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20775280 is an abundant number, since it is smaller than the sum of its proper divisors (27527432).

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

20775280 is a wasteful number, since it uses less digits than its factorization.

20775280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259704 (or 259698 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 31.

The square root of 20775280 is about 4557.9907854229. The cubic root of 20775280 is about 274.9047824621.

The spelling of 20775280 in words is "twenty million, seven hundred seventy-five thousand, two hundred eighty".