1553440220 has 12 divisors (see below), whose sum is σ = 3262224504. Its totient is φ = 621376080.

The previous prime is 1553440211. The next prime is 1553440243. The reversal of 1553440220 is 220443551.

It is a happy number.

It is a super-2 number, since 2×1553440220² = 4826353034227296800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1553440220.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38835986 + ... + 38836025.

It is an arithmetic number, because the mean of its divisors is an integer number (271852042).

Almost surely, 2^1553440220 is an apocalyptic number.

1553440220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1553440220 is an abundant number, since it is smaller than the sum of its proper divisors (1708784284).

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

1553440220 is a wasteful number, since it uses less digits than its factorization.

1553440220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77672020 (or 77672018 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 1553440220 is about 39413.7059916979. The cubic root of 1553440220 is about 1158.1500984190.

Adding to 1553440220 its reverse (220443551), we get a palindrome (1773883771).

The spelling of 1553440220 in words is "one billion, five hundred fifty-three million, four hundred forty thousand, two hundred twenty".