1520736820 has 24 divisors (see below), whose sum is σ = 3361629600. Its totient is φ = 576279072.

The previous prime is 1520736779. The next prime is 1520736821. The reversal of 1520736820 is 286370251.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1520736821) 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, 2000590 + ... + 2001349.

It is an arithmetic number, because the mean of its divisors is an integer number (140067900).

Almost surely, 2^1520736820 is an apocalyptic number.

1520736820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1520736820 is an abundant number, since it is smaller than the sum of its proper divisors (1840892780).

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

1520736820 is a wasteful number, since it uses less digits than its factorization.

1520736820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4001967 (or 4001965 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 1520736820 is about 38996.6257514673. The cubic root of 1520736820 is about 1149.9651709679.

The spelling of 1520736820 in words is "one billion, five hundred twenty million, seven hundred thirty-six thousand, eight hundred twenty".