20511033020 has 12 divisors (see below), whose sum is σ = 43073169384. Its totient is φ = 8204413200.

The previous prime is 20511033017. The next prime is 20511033047. The reversal of 20511033020 is 2033011502.

It is a self number, because there is not a number n which added to its sum of digits gives 20511033020.

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 3 ways as a sum of consecutive naturals, for example, 512775806 + ... + 512775845.

It is an arithmetic number, because the mean of its divisors is an integer number (3589430782).

Almost surely, 2^20511033020 is an apocalyptic number.

20511033020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20511033020 is an abundant number, since it is smaller than the sum of its proper divisors (22562136364).

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

20511033020 is a wasteful number, since it uses less digits than its factorization.

20511033020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025551660 (or 1025551658 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 17.

Adding to 20511033020 its reverse (2033011502), we get a palindrome (22544044522).

The spelling of 20511033020 in words is "twenty billion, five hundred eleven million, thirty-three thousand, twenty".