20485278 has 32 divisors (see below), whose sum is σ = 49662720. Its totient is φ = 6207480.

The previous prime is 20485277. The next prime is 20485301. The reversal of 20485278 is 87258402.

It is a happy number.

It is a super-2 number, since 2×20485278² = 839293229474568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20485271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16650 + ... + 17837.

It is an arithmetic number, because the mean of its divisors is an integer number (1551960).

Almost surely, 2^20485278 is an apocalyptic number.

20485278 is an abundant number, since it is smaller than the sum of its proper divisors (29177442).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20485278 is a wasteful number, since it uses less digits than its factorization.

20485278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34509 (or 34503 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The square root of 20485278 is about 4526.0665041513. The cubic root of 20485278 is about 273.6196527127.

The spelling of 20485278 in words is "twenty million, four hundred eighty-five thousand, two hundred seventy-eight".