20708440 has 16 divisors (see below), whose sum is σ = 46594080. Its totient is φ = 8283360.

The previous prime is 20708399. The next prime is 20708447. The reversal of 20708440 is 4480702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20708447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 258816 + ... + 258895.

It is an arithmetic number, because the mean of its divisors is an integer number (2912130).

Almost surely, 2^20708440 is an apocalyptic number.

20708440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20708440 is an abundant number, since it is smaller than the sum of its proper divisors (25885640).

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

20708440 is a wasteful number, since it uses less digits than its factorization.

20708440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517722 (or 517718 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 20708440 is about 4550.6527004376. The cubic root of 20708440 is about 274.6096500349.

The spelling of 20708440 in words is "twenty million, seven hundred eight thousand, four hundred forty".