20021452320540 has 96 divisors (see below), whose sum is σ = 63815411713536. Its totient is φ = 4642655607040.

The previous prime is 20021452320521. The next prime is 20021452320581. The reversal of 20021452320540 is 4502325412002.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 20021452320498 and 20021452320507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 659452947 + ... + 659483306.

It is an arithmetic number, because the mean of its divisors is an integer number (664743872016).

Almost surely, 2^{20021452320540} is an apocalyptic number.

20021452320540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021452320540 is an abundant number, since it is smaller than the sum of its proper divisors (43793959392996).

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

20021452320540 is a wasteful number, since it uses less digits than its factorization.

20021452320540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1318936299 (or 1318936297 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

Adding to 20021452320540 its reverse (4502325412002), we get a palindrome (24523777732542).

The spelling of 20021452320540 in words is "twenty trillion, twenty-one billion, four hundred fifty-two million, three hundred twenty thousand, five hundred forty".