20738340 has 144 divisors (see below), whose sum is σ = 73032960. Its totient is φ = 4665600.

The previous prime is 20738321. The next prime is 20738359. The reversal of 20738340 is 4383702.

It is an interprime number because it is at equal distance from previous prime (20738321) and next prime (20738359).

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 137265 + ... + 137415.

Almost surely, 2^20738340 is an apocalyptic number.

20738340 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 20738340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36516480).

20738340 is an abundant number, since it is smaller than the sum of its proper divisors (52294620).

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

20738340 is a wasteful number, since it uses less digits than its factorization.

20738340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282 (or 277 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 20738340 is about 4553.9367584542. The cubic root of 20738340 is about 274.7417520499.

The spelling of 20738340 in words is "twenty million, seven hundred thirty-eight thousand, three hundred forty".