20021020013 has 16 divisors (see below), whose sum is σ = 21469691136. Its totient is φ = 18621187200.

The previous prime is 20021019989. The next prime is 20021020027. The reversal of 20021020013 is 31002012002.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20021020013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20021019976 and 20021020003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021022013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1526120 + ... + 1539182.

It is an arithmetic number, because the mean of its divisors is an integer number (1341855696).

Almost surely, 2^20021020013 is an apocalyptic number.

20021020013 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20021020013 is a deficient number, since it is larger than the sum of its proper divisors (1448671123).

20021020013 is a wasteful number, since it uses less digits than its factorization.

20021020013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14924.

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 20021020013 its reverse (31002012002), we get a palindrome (51023032015).

The spelling of 20021020013 in words is "twenty billion, twenty-one million, twenty thousand, thirteen".