20274840 has 64 divisors (see below), whose sum is σ = 67586400. Its totient is φ = 5406336.

The previous prime is 20274833. The next prime is 20274847. The reversal of 20274840 is 4847202.

It is an interprime number because it is at equal distance from previous prime (20274833) and next prime (20274847).

It is a super-2 number, since 2×20274840² = 822138274051200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20274847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8307 + ... + 10466.

Almost surely, 2^20274840 is an apocalyptic number.

20274840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20274840 is an abundant number, since it is smaller than the sum of its proper divisors (47311560).

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

20274840 is a wasteful number, since it uses less digits than its factorization.

20274840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18793 (or 18783 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 20274840 is about 4502.7591541187. The cubic root of 20274840 is about 272.6794934482.

The spelling of 20274840 in words is "twenty million, two hundred seventy-four thousand, eight hundred forty".