20478212 has 12 divisors (see below), whose sum is σ = 36099420. Its totient is φ = 10164096.

The previous prime is 20478209. The next prime is 20478223. The reversal of 20478212 is 21287402.

It can be written as a sum of positive squares in 2 ways, for example, as 14258176 + 6220036 = 3776^2 + 2494^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18137 + ... + 19232.

It is an arithmetic number, because the mean of its divisors is an integer number (3008285).

Almost surely, 2^20478212 is an apocalyptic number.

It is an amenable number.

20478212 is a deficient number, since it is larger than the sum of its proper divisors (15621208).

20478212 is a wasteful number, since it uses less digits than its factorization.

20478212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37510 (or 37508 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 20478212 is about 4525.2858473250. The cubic root of 20478212 is about 273.5881891610.

The spelling of 20478212 in words is "twenty million, four hundred seventy-eight thousand, two hundred twelve".