2020721550 has 24 divisors (see below), whose sum is σ = 5011389816. Its totient is φ = 538859040.

The previous prime is 2020721471. The next prime is 2020721551. The reversal of 2020721550 is 551270202.

It is a self number, because there is not a number n which added to its sum of digits gives 2020721550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2020721551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6735589 + ... + 6735888.

It is an arithmetic number, because the mean of its divisors is an integer number (208807909).

Almost surely, 2^2020721550 is an apocalyptic number.

2020721550 is an abundant number, since it is smaller than the sum of its proper divisors (2990668266).

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

2020721550 is a wasteful number, since it uses less digits than its factorization.

2020721550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13471492 (or 13471487 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 2020721550 is about 44952.4365301815. The cubic root of 2020721550 is about 1264.2573611877.

Adding to 2020721550 its reverse (551270202), we get a palindrome (2571991752).

The spelling of 2020721550 in words is "two billion, twenty million, seven hundred twenty-one thousand, five hundred fifty".