20071478 has 24 divisors (see below), whose sum is σ = 35362800. Its totient is φ = 8518608.

The previous prime is 20071417. The next prime is 20071481. The reversal of 20071478 is 87417002.

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 20071478.

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, 9743 + ... + 11621.

It is an arithmetic number, because the mean of its divisors is an integer number (1473450).

Almost surely, 2^20071478 is an apocalyptic number.

20071478 is a deficient number, since it is larger than the sum of its proper divisors (15291322).

20071478 is a wasteful number, since it uses less digits than its factorization.

20071478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2004 (or 1997 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 20071478 is about 4480.1203108845. The cubic root of 20071478 is about 271.7647457642.

The spelling of 20071478 in words is "twenty million, seventy-one thousand, four hundred seventy-eight".