20684025 has 24 divisors (see below), whose sum is σ = 37998560. Its totient is φ = 11031120.

The previous prime is 20684021. The next prime is 20684029. The reversal of 20684025 is 52048602.

It is an interprime number because it is at equal distance from previous prime (20684021) and next prime (20684029).

It is not a de Polignac number, because 20684025 - 2² = 20684021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20684025.

It is not an unprimeable number, because it can be changed into a prime (20684021) 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, 14647 + ... + 15996.

Almost surely, 2^20684025 is an apocalyptic number.

20684025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20684025 is a deficient number, since it is larger than the sum of its proper divisors (17314535).

20684025 is a wasteful number, since it uses less digits than its factorization.

20684025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30662 (or 30651 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 20684025 is about 4547.9693270733. The cubic root of 20684025 is about 274.5016871108.

The spelling of 20684025 in words is "twenty million, six hundred eighty-four thousand, twenty-five".