20709092440 has 128 divisors (see below), whose sum is σ = 48970137600. Its totient is φ = 7872560640.

The previous prime is 20709092387. The next prime is 20709092449. The reversal of 20709092440 is 4429090702.

It is a self number, because there is not a number n which added to its sum of digits gives 20709092440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20709092449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16849746 + ... + 16850974.

It is an arithmetic number, because the mean of its divisors is an integer number (382579200).

Almost surely, 2^20709092440 is an apocalyptic number.

20709092440 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 20709092440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24485068800).

20709092440 is an abundant number, since it is smaller than the sum of its proper divisors (28261045160).

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

20709092440 is a wasteful number, since it uses less digits than its factorization.

20709092440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1505 (or 1501 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 37.

The spelling of 20709092440 in words is "twenty billion, seven hundred nine million, ninety-two thousand, four hundred forty".