20005725 has 24 divisors (see below), whose sum is σ = 33306400. Its totient is φ = 10595520.

The previous prime is 20005721. The next prime is 20005729. The reversal of 20005725 is 52750002.

It is an interprime number because it is at equal distance from previous prime (20005721) and next prime (20005729).

It is not a de Polignac number, because 20005725 - 2² = 20005721 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20005721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10926 + ... + 12624.

Almost surely, 2^20005725 is an apocalyptic number.

20005725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20005725 is a deficient number, since it is larger than the sum of its proper divisors (13300675).

20005725 is a wasteful number, since it uses less digits than its factorization.

20005725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1869 (or 1864 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 21.

The square root of 20005725 is about 4472.7759836594. The cubic root of 20005725 is about 271.4676592567.

Adding to 20005725 its reverse (52750002), we get a palindrome (72755727).

The spelling of 20005725 in words is "twenty million, five thousand, seven hundred twenty-five".