20667525 has 24 divisors (see below), whose sum is σ = 34343040. Its totient is φ = 10967040.

The previous prime is 20667511. The next prime is 20667527. The reversal of 20667525 is 52576602.

It is not a de Polignac number, because 20667525 - 2⁷ = 20667397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20667527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17349 + ... + 18501.

It is an arithmetic number, because the mean of its divisors is an integer number (1430960).

Almost surely, 2^20667525 is an apocalyptic number.

20667525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20667525 is a deficient number, since it is larger than the sum of its proper divisors (13675515).

20667525 is a wasteful number, since it uses less digits than its factorization.

20667525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1405 (or 1400 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 33.

The square root of 20667525 is about 4546.1549687621. The cubic root of 20667525 is about 274.4286761320.

It can be divided in two parts, 2066 and 7525, that added together give a triangular number (9591 = T₁₃₈).

The spelling of 20667525 in words is "twenty million, six hundred sixty-seven thousand, five hundred twenty-five".