20020455021 has 64 divisors (see below), whose sum is σ = 32955955200. Its totient is φ = 10554624000.

The previous prime is 20020455001. The next prime is 20020455043. The reversal of 20020455021 is 12055402002.

It is a happy number.

It is not a de Polignac number, because 20020455021 - 2⁷ = 20020454893 is a prime.

It is a super-2 number, since 2×20020455021² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20020455001) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 16669221 + ... + 16670421.

It is an arithmetic number, because the mean of its divisors is an integer number (514936800).

Almost surely, 2^20020455021 is an apocalyptic number.

20020455021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20020455021 is a deficient number, since it is larger than the sum of its proper divisors (12935500179).

20020455021 is a wasteful number, since it uses less digits than its factorization.

20020455021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2290.

The product of its (nonzero) digits is 800, while the sum is 21.

Adding to 20020455021 its reverse (12055402002), we get a palindrome (32075857023).

The spelling of 20020455021 in words is "twenty billion, twenty million, four hundred fifty-five thousand, twenty-one".