20210455520 has 48 divisors (see below), whose sum is σ = 48219984288. Its totient is φ = 8004134400.

The previous prime is 20210455519. The next prime is 20210455543. The reversal of 20210455520 is 2555401202.

It is a self number, because there is not a number n which added to its sum of digits gives 20210455520.

It is a congruent number.

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, 609164 + ... + 641483.

It is an arithmetic number, because the mean of its divisors is an integer number (1004583006).

Almost surely, 2^20210455520 is an apocalyptic number.

20210455520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20210455520 is an abundant number, since it is smaller than the sum of its proper divisors (28009528768).

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

20210455520 is a wasteful number, since it uses less digits than its factorization.

20210455520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1250763 (or 1250755 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 26.

Adding to 20210455520 its reverse (2555401202), we get a palindrome (22765856722).

The spelling of 20210455520 in words is "twenty billion, two hundred ten million, four hundred fifty-five thousand, five hundred twenty".