20612440 has 16 divisors (see below), whose sum is σ = 46378080. Its totient is φ = 8244960.

The previous prime is 20612429. The next prime is 20612447. The reversal of 20612440 is 4421602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20612447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 257616 + ... + 257695.

It is an arithmetic number, because the mean of its divisors is an integer number (2898630).

Almost surely, 2^20612440 is an apocalyptic number.

20612440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20612440 is an abundant number, since it is smaller than the sum of its proper divisors (25765640).

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

20612440 is a wasteful number, since it uses less digits than its factorization.

20612440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515322 (or 515318 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 20612440 is about 4540.0925100707. The cubic root of 20612440 is about 274.1846483014.

The spelling of 20612440 in words is "twenty million, six hundred twelve thousand, four hundred forty".