20738449340 has 36 divisors (see below), whose sum is σ = 50661071496. Its totient is φ = 7110325152.

The previous prime is 20738449339. The next prime is 20738449349. The reversal of 20738449340 is 4394483702.

It is a junction number, because it is equal to n+sod(n) for n = 20738449291 and 20738449300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20738449349) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10579862 + ... + 10581821.

It is an arithmetic number, because the mean of its divisors is an integer number (1407251986).

Almost surely, 2^20738449340 is an apocalyptic number.

20738449340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20738449340 is an abundant number, since it is smaller than the sum of its proper divisors (29922622156).

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

20738449340 is a wasteful number, since it uses less digits than its factorization.

20738449340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21161706 (or 21161697 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 44.

The spelling of 20738449340 in words is "twenty billion, seven hundred thirty-eight million, four hundred forty-nine thousand, three hundred forty".