20405330474 has 4 divisors (see below), whose sum is σ = 30607995714. Its totient is φ = 10202665236.

The previous prime is 20405330471. The next prime is 20405330479. The reversal of 20405330474 is 47403350402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12497674849 + 7907655625 = 111793^2 + 88925^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20405330474.

It is not an unprimeable number, because it can be changed into a prime (20405330471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5101332617 + ... + 5101332620.

Almost surely, 2^20405330474 is an apocalyptic number.

20405330474 is a deficient number, since it is larger than the sum of its proper divisors (10202665240).

20405330474 is a wasteful number, since it uses less digits than its factorization.

20405330474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10202665239.

The product of its (nonzero) digits is 40320, while the sum is 32.

Adding to 20405330474 its reverse (47403350402), we get a palindrome (67808680876).

The spelling of 20405330474 in words is "twenty billion, four hundred five million, three hundred thirty thousand, four hundred seventy-four".