20974280 has 32 divisors (see below), whose sum is σ = 47469240. Its totient is φ = 8340480.

The previous prime is 20974253. The next prime is 20974297. The reversal of 20974280 is 8247902.

It can be written as a sum of positive squares in 4 ways, for example, as 5654884 + 15319396 = 2378^2 + 3914^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5792 + ... + 8688.

Almost surely, 2^20974280 is an apocalyptic number.

20974280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20974280 is an abundant number, since it is smaller than the sum of its proper divisors (26494960).

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

20974280 is a wasteful number, since it uses less digits than its factorization.

20974280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3089 (or 3085 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 20974280 is about 4579.7685531040. The cubic root of 20974280 is about 275.7797374491.

The spelling of 20974280 in words is "twenty million, nine hundred seventy-four thousand, two hundred eighty".