1297820220 has 24 divisors (see below), whose sum is σ = 3633896784. Its totient is φ = 346085376.

The previous prime is 1297820219. The next prime is 1297820243. The reversal of 1297820220 is 220287921.

1297820220 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10815109 + ... + 10815228.

It is an arithmetic number, because the mean of its divisors is an integer number (151412366).

Almost surely, 2^1297820220 is an apocalyptic number.

1297820220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1297820220 is an abundant number, since it is smaller than the sum of its proper divisors (2336076564).

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

1297820220 is a wasteful number, since it uses less digits than its factorization.

1297820220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21630349 (or 21630347 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 1297820220 is about 36025.2719628874. The cubic root of 1297820220 is about 1090.7825427323.

The spelling of 1297820220 in words is "one billion, two hundred ninety-seven million, eight hundred twenty thousand, two hundred twenty".