20006340 has 24 divisors (see below), whose sum is σ = 56017920. Its totient is φ = 5335008.

The previous prime is 20006339. The next prime is 20006351. The reversal of 20006340 is 4360002.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166660 + ... + 166779.

It is an arithmetic number, because the mean of its divisors is an integer number (2334080).

Almost surely, 2^20006340 is an apocalyptic number.

20006340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20006340 is an abundant number, since it is smaller than the sum of its proper divisors (36011580).

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

20006340 is a wasteful number, since it uses less digits than its factorization.

20006340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333451 (or 333449 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 20006340 is about 4472.8447323823. The cubic root of 20006340 is about 271.4704409754.

Adding to 20006340 its reverse (4360002), we get a palindrome (24366342).

The spelling of 20006340 in words is "twenty million, six thousand, three hundred forty".