20965280 has 48 divisors (see below), whose sum is σ = 56609280. Its totient is φ = 7187712.

The previous prime is 20965279. The next prime is 20965283. The reversal of 20965280 is 8256902.

20965280 = T₁₉₀ + T₁₉₁ + ... + T₅₀₉.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (20965283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8240 + ... + 10479.

It is an arithmetic number, because the mean of its divisors is an integer number (1179360).

Almost surely, 2^20965280 is an apocalyptic number.

20965280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20965280 is an abundant number, since it is smaller than the sum of its proper divisors (35644000).

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

20965280 is a wasteful number, since it uses less digits than its factorization.

20965280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18741 (or 18733 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 20965280 is about 4578.7858652704. The cubic root of 20965280 is about 275.7402863892.

The spelling of 20965280 in words is "twenty million, nine hundred sixty-five thousand, two hundred eighty".