20674240 has 84 divisors (see below), whose sum is σ = 52358544. Its totient is φ = 7760896.

The previous prime is 20674237. The next prime is 20674243. The reversal of 20674240 is 4247602.

It is an interprime number because it is at equal distance from previous prime (20674237) and next prime (20674243).

It is not an unprimeable number, because it can be changed into a prime (20674243) 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 11 ways as a sum of consecutive naturals, for example, 390054 + ... + 390106.

It is an arithmetic number, because the mean of its divisors is an integer number (623316).

Almost surely, 2^20674240 is an apocalyptic number.

20674240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20674240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26179272).

20674240 is an abundant number, since it is smaller than the sum of its proper divisors (31684304).

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

20674240 is an equidigital number, since it uses as much as digits as its factorization.

20674240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146 (or 83 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 20674240 is about 4546.8934449798. The cubic root of 20674240 is about 274.4583940754.

The spelling of 20674240 in words is "twenty million, six hundred seventy-four thousand, two hundred forty".