20530404004 has 24 divisors (see below), whose sum is σ = 39296775168. Its totient is φ = 9307628640.

The previous prime is 20530403947. The next prime is 20530404067. The reversal of 20530404004 is 40040403502.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 592287 + ... + 625990.

It is an arithmetic number, because the mean of its divisors is an integer number (1637365632).

Almost surely, 2^20530404004 is an apocalyptic number.

It is an amenable number.

20530404004 is a deficient number, since it is larger than the sum of its proper divisors (18766371164).

20530404004 is a wasteful number, since it uses less digits than its factorization.

20530404004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1218675 (or 1218673 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 22.

Adding to 20530404004 its reverse (40040403502), we get a palindrome (60570807506).

The spelling of 20530404004 in words is "twenty billion, five hundred thirty million, four hundred four thousand, four".