20020311504 has 30 divisors (see below), whose sum is σ = 56029066626. Its totient is φ = 6673437120.

The previous prime is 20020311499. The next prime is 20020311529. The reversal of 20020311504 is 40511302002.

It can be written as a sum of positive squares in only one way, i.e., 10455471504 + 9564840000 = 102252^2 + 97800^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 69514827 + ... + 69515114.

Almost surely, 2^20020311504 is an apocalyptic number.

20020311504 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20020311504 is an abundant number, since it is smaller than the sum of its proper divisors (36008755122).

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

20020311504 is a wasteful number, since it uses less digits than its factorization.

20020311504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139029955 (or 139029946 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

Adding to 20020311504 its reverse (40511302002), we get a palindrome (60531613506).

The spelling of 20020311504 in words is "twenty billion, twenty million, three hundred eleven thousand, five hundred four".