20297340 has 144 divisors (see below), whose sum is σ = 71547840. Its totient is φ = 4561920.

The previous prime is 20297317. The next prime is 20297341. The reversal of 20297340 is 4379202.

It is a super-2 number, since 2×20297340² = 823964022151200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20297341) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 112050 + ... + 112230.

It is an arithmetic number, because the mean of its divisors is an integer number (496860).

Almost surely, 2^20297340 is an apocalyptic number.

20297340 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 20297340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35773920).

20297340 is an abundant number, since it is smaller than the sum of its proper divisors (51250500).

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

20297340 is a wasteful number, since it uses less digits than its factorization.

20297340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292 (or 287 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 20297340 is about 4505.2569294104. The cubic root of 20297340 is about 272.7803248309.

The spelling of 20297340 in words is "twenty million, two hundred ninety-seven thousand, three hundred forty".