20278525 has 12 divisors (see below), whose sum is σ = 26239392. Its totient is φ = 15517040.

The previous prime is 20278519. The next prime is 20278549. The reversal of 20278525 is 52587202.

It is not a de Polignac number, because 20278525 - 2⁵ = 20278493 is a prime.

It is a super-2 number, since 2×20278525² = 822437152351250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17059 + ... + 18208.

It is an arithmetic number, because the mean of its divisors is an integer number (2186616).

Almost surely, 2^20278525 is an apocalyptic number.

20278525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20278525 is a deficient number, since it is larger than the sum of its proper divisors (5960867).

20278525 is a wasteful number, since it uses less digits than its factorization.

20278525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35300 (or 35295 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 31.

The square root of 20278525 is about 4503.1683290768. The cubic root of 20278525 is about 272.6960124945.

The spelling of 20278525 in words is "twenty million, two hundred seventy-eight thousand, five hundred twenty-five".