1420866820 has 24 divisors (see below), whose sum is σ = 2986210584. Its totient is φ = 567891456.

The previous prime is 1420866779. The next prime is 1420866827. The reversal of 1420866820 is 286680241.

It can be written as a sum of positive squares in 4 ways, for example, as 42823936 + 1378042884 = 6544^2 + 37122^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1420866820.

It is not an unprimeable number, because it can be changed into a prime (1420866827) 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, 2277 + ... + 53356.

It is an arithmetic number, because the mean of its divisors is an integer number (124425441).

Almost surely, 2^1420866820 is an apocalyptic number.

1420866820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1420866820 is an abundant number, since it is smaller than the sum of its proper divisors (1565343764).

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

1420866820 is a wasteful number, since it uses less digits than its factorization.

1420866820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56919 (or 56917 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 37.

The square root of 1420866820 is about 37694.3871153253. The cubic root of 1420866820 is about 1124.2195264873.

The spelling of 1420866820 in words is "one billion, four hundred twenty million, eight hundred sixty-six thousand, eight hundred twenty".