20211725 has 24 divisors (see below), whose sum is σ = 27944640. Its totient is φ = 14411520.

The previous prime is 20211707. The next prime is 20211743. The reversal of 20211725 is 52711202.

It is an interprime number because it is at equal distance from previous prime (20211707) and next prime (20211743).

It is not a de Polignac number, because 20211725 - 2⁶ = 20211661 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20211697 and 20211706.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6824 + ... + 9326.

It is an arithmetic number, because the mean of its divisors is an integer number (1164360).

Almost surely, 2^20211725 is an apocalyptic number.

20211725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20211725 is a deficient number, since it is larger than the sum of its proper divisors (7732915).

20211725 is a wasteful number, since it uses less digits than its factorization.

20211725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2549 (or 2544 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 20211725 is about 4495.7452107521. The cubic root of 20211725 is about 272.3962515018.

Adding to 20211725 its reverse (52711202), we get a palindrome (72922927).

The spelling of 20211725 in words is "twenty million, two hundred eleven thousand, seven hundred twenty-five".