2057215820 has 48 divisors (see below), whose sum is σ = 4719381408. Its totient is φ = 747048960.

The previous prime is 2057215739. The next prime is 2057215843. The reversal of 2057215820 is 285127502.

It is a happy 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 15 ways as a sum of consecutive naturals, for example, 164012 + ... + 176108.

It is an arithmetic number, because the mean of its divisors is an integer number (98320446).

Almost surely, 2^2057215820 is an apocalyptic number.

2057215820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2057215820 is an abundant number, since it is smaller than the sum of its proper divisors (2662165588).

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

2057215820 is a wasteful number, since it uses less digits than its factorization.

2057215820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12890 (or 12888 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 2057215820 is about 45356.5410938709. The cubic root of 2057215820 is about 1271.8228355435.

The spelling of 2057215820 in words is "two billion, fifty-seven million, two hundred fifteen thousand, eight hundred twenty".