20245340 has 12 divisors (see below), whose sum is σ = 42515256. Its totient is φ = 8098128.

The previous prime is 20245339. The next prime is 20245343. The reversal of 20245340 is 4354202.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1012267 = 20245340 / (2 + 0 + 2 + 4 + 5 + 3 + 4 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20245343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 506114 + ... + 506153.

It is an arithmetic number, because the mean of its divisors is an integer number (3542938).

Almost surely, 2^20245340 is an apocalyptic number.

20245340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20245340 is an abundant number, since it is smaller than the sum of its proper divisors (22269916).

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

20245340 is a wasteful number, since it uses less digits than its factorization.

20245340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1012276 (or 1012274 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 20245340 is about 4499.4821924306. The cubic root of 20245340 is about 272.5471792172.

Adding to 20245340 its reverse (4354202), we get a palindrome (24599542).

The spelling of 20245340 in words is "twenty million, two hundred forty-five thousand, three hundred forty".