20471730 has 32 divisors (see below), whose sum is σ = 50462784. Its totient is φ = 5311296.

The previous prime is 20471719. The next prime is 20471747. The reversal of 20471730 is 3717402.

It is a self number, because there is not a number n which added to its sum of digits gives 20471730.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8112 + ... + 10331.

It is an arithmetic number, because the mean of its divisors is an integer number (1576962).

Almost surely, 2^20471730 is an apocalyptic number.

20471730 is an abundant number, since it is smaller than the sum of its proper divisors (29991054).

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

20471730 is a wasteful number, since it uses less digits than its factorization.

20471730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18490.

The product of its (nonzero) digits is 1176, while the sum is 24.

The square root of 20471730 is about 4524.5695927900. The cubic root of 20471730 is about 273.5593196844.

The spelling of 20471730 in words is "twenty million, four hundred seventy-one thousand, seven hundred thirty".