1820220040 has 32 divisors (see below), whose sum is σ = 4147344000. Its totient is φ = 718870464.

The previous prime is 1820220037. The next prime is 1820220043. The reversal of 1820220040 is 400220281.

It is an interprime number because it is at equal distance from previous prime (1820220037) and next prime (1820220043).

It is not an unprimeable number, because it can be changed into a prime (1820220043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 284850 + ... + 291169.

It is an arithmetic number, because the mean of its divisors is an integer number (129604500).

Almost surely, 2^1820220040 is an apocalyptic number.

1820220040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1820220040 is an abundant number, since it is smaller than the sum of its proper divisors (2327123960).

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

1820220040 is a wasteful number, since it uses less digits than its factorization.

1820220040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576109 (or 576105 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 1820220040 is about 42664.0368460370. The cubic root of 1820220040 is about 1220.9783516560.

The spelling of 1820220040 in words is "one billion, eight hundred twenty million, two hundred twenty thousand, forty".