1057206820 has 12 divisors (see below), whose sum is σ = 2220134364. Its totient is φ = 422882720.

The previous prime is 1057206817. The next prime is 1057206823. The reversal of 1057206820 is 286027501.

It is an interprime number because it is at equal distance from previous prime (1057206817) and next prime (1057206823).

It can be written as a sum of positive squares in 2 ways, for example, as 707666404 + 349540416 = 26602^2 + 18696^2 .

It is a super-2 number, since 2×1057206820² = 2235372520509024800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1057206823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26430151 + ... + 26430190.

It is an arithmetic number, because the mean of its divisors is an integer number (185011197).

Almost surely, 2^1057206820 is an apocalyptic number.

1057206820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1057206820 is an abundant number, since it is smaller than the sum of its proper divisors (1162927544).

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

1057206820 is a wasteful number, since it uses less digits than its factorization.

1057206820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52860350 (or 52860348 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 1057206820 is about 32514.7169755482. The cubic root of 1057206820 is about 1018.7164490437.

The spelling of 1057206820 in words is "one billion, fifty-seven million, two hundred six thousand, eight hundred twenty".