20758740 has 24 divisors (see below), whose sum is σ = 58124640. Its totient is φ = 5535648.

The previous prime is 20758721. The next prime is 20758741. The reversal of 20758740 is 4785702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20758741) 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 7 ways as a sum of consecutive naturals, for example, 172930 + ... + 173049.

It is an arithmetic number, because the mean of its divisors is an integer number (2421860).

Almost surely, 2^20758740 is an apocalyptic number.

20758740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20758740 is an abundant number, since it is smaller than the sum of its proper divisors (37365900).

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

20758740 is a wasteful number, since it uses less digits than its factorization.

20758740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345991 (or 345989 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 33.

The square root of 20758740 is about 4556.1760282061. The cubic root of 20758740 is about 274.8318090005.

The spelling of 20758740 in words is "twenty million, seven hundred fifty-eight thousand, seven hundred forty".