621531652020 has 48 divisors (see below), whose sum is σ = 1769785053120. Its totient is φ = 162932590336.

The previous prime is 621531651997. The next prime is 621531652037. The reversal of 621531652020 is 20256135126.

621531652020 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87783417 + ... + 87790496.

It is an arithmetic number, because the mean of its divisors is an integer number (36870521940).

Almost surely, 2^621531652020 is an apocalyptic number.

621531652020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

621531652020 is an abundant number, since it is smaller than the sum of its proper divisors (1148253401100).

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

621531652020 is a wasteful number, since it uses less digits than its factorization.

621531652020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175573984 (or 175573982 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

Adding to 621531652020 its reverse (20256135126), we get a palindrome (641787787146).

The spelling of 621531652020 in words is "six hundred twenty-one billion, five hundred thirty-one million, six hundred fifty-two thousand, twenty".