20625340 has 12 divisors (see below), whose sum is σ = 43313256. Its totient is φ = 8250128.

The previous prime is 20625313. The next prime is 20625359. The reversal of 20625340 is 4352602.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 515614 + ... + 515653.

It is an arithmetic number, because the mean of its divisors is an integer number (3609438).

Almost surely, 2^20625340 is an apocalyptic number.

20625340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20625340 is an abundant number, since it is smaller than the sum of its proper divisors (22687916).

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

20625340 is a wasteful number, since it uses less digits than its factorization.

20625340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1031276 (or 1031274 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 20625340 is about 4541.5129637600. The cubic root of 20625340 is about 274.2418345501.

Adding to 20625340 its reverse (4352602), we get a palindrome (24977942).

The spelling of 20625340 in words is "twenty million, six hundred twenty-five thousand, three hundred forty".