20471478 has 16 divisors (see below), whose sum is σ = 41614896. Its totient is φ = 6711840.

The previous prime is 20471459. The next prime is 20471489. The reversal of 20471478 is 87417402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27601 + ... + 28332.

It is an arithmetic number, because the mean of its divisors is an integer number (2600931).

Almost surely, 2^20471478 is an apocalyptic number.

20471478 is an abundant number, since it is smaller than the sum of its proper divisors (21143418).

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

20471478 is a wasteful number, since it uses less digits than its factorization.

20471478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55999.

The product of its (nonzero) digits is 12544, while the sum is 33.

The square root of 20471478 is about 4524.5417447516. The cubic root of 20471478 is about 273.5581972059.

The spelling of 20471478 in words is "twenty million, four hundred seventy-one thousand, four hundred seventy-eight".