20473930 has 8 divisors (see below), whose sum is σ = 36853092. Its totient is φ = 8189568.

The previous prime is 20473909. The next prime is 20473931. The reversal of 20473930 is 3937402.

It can be written as a sum of positive squares in 2 ways, for example, as 19954089 + 519841 = 4467^2 + 721^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20473931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1023687 + ... + 1023706.

Almost surely, 2^20473930 is an apocalyptic number.

20473930 is a deficient number, since it is larger than the sum of its proper divisors (16379162).

20473930 is a wasteful number, since it uses less digits than its factorization.

20473930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2047400.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 20473930 is about 4524.8127033061. The cubic root of 20473930 is about 273.5691187088.

The spelling of 20473930 in words is "twenty million, four hundred seventy-three thousand, nine hundred thirty".