20021403240420 has 24 divisors (see below), whose sum is σ = 56059929073344. Its totient is φ = 5339040864096.

The previous prime is 20021403240413. The next prime is 20021403240431. The reversal of 20021403240420 is 2404230412002.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166845026944 + ... + 166845027063.

It is an arithmetic number, because the mean of its divisors is an integer number (2335830378056).

Almost surely, 2^{20021403240420} is an apocalyptic number.

20021403240420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021403240420 is an abundant number, since it is smaller than the sum of its proper divisors (36038525832924).

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

20021403240420 is a wasteful number, since it uses less digits than its factorization.

20021403240420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333690054019 (or 333690054017 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 20021403240420 its reverse (2404230412002), we get a palindrome (22425633652422).

The spelling of 20021403240420 in words is "twenty trillion, twenty-one billion, four hundred three million, two hundred forty thousand, four hundred twenty".