1820422520 has 48 divisors (see below), whose sum is σ = 4764682440. Its totient is φ = 624144192.

The previous prime is 1820422519. The next prime is 1820422529. The reversal of 1820422520 is 252240281.

It is a self number, because there is not a number n which added to its sum of digits gives 1820422520.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820422529) 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, 462434 + ... + 466353.

Almost surely, 2^1820422520 is an apocalyptic number.

1820422520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1820422520 is an abundant number, since it is smaller than the sum of its proper divisors (2944259920).

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

1820422520 is a wasteful number, since it uses less digits than its factorization.

1820422520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 928812 (or 928801 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 1820422520 is about 42666.4097388098. The cubic root of 1820422520 is about 1221.0236235690.

The spelling of 1820422520 in words is "one billion, eight hundred twenty million, four hundred twenty-two thousand, five hundred twenty".