1820131620 has 48 divisors (see below), whose sum is σ = 5098325568. Its totient is φ = 485182080.

The previous prime is 1820131609. The next prime is 1820131631. The reversal of 1820131620 is 261310281.

It is an interprime number because it is at equal distance from previous prime (1820131609) and next prime (1820131631).

It is a super-2 number, since 2×1820131620² = 6625758228247648800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 232002 + ... + 239718.

It is an arithmetic number, because the mean of its divisors is an integer number (106215116).

Almost surely, 2^1820131620 is an apocalyptic number.

1820131620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1820131620 is an abundant number, since it is smaller than the sum of its proper divisors (3278193948).

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

1820131620 is a wasteful number, since it uses less digits than its factorization.

1820131620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11660 (or 11658 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 1820131620 is about 42663.0005977076. Note that the first 3 decimals coincide. The cubic root of 1820131620 is about 1220.9585810327.

The spelling of 1820131620 in words is "one billion, eight hundred twenty million, one hundred thirty-one thousand, six hundred twenty".