1213132020 has 24 divisors (see below), whose sum is σ = 3396769824. Its totient is φ = 323501856.

The previous prime is 1213132013. The next prime is 1213132049. The reversal of 1213132020 is 202313121.

It is a Harshad number since it is a multiple of its sum of digits (15).

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, 10109374 + ... + 10109493.

It is an arithmetic number, because the mean of its divisors is an integer number (141532076).

Almost surely, 2^1213132020 is an apocalyptic number.

1213132020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213132020 is an abundant number, since it is smaller than the sum of its proper divisors (2183637804).

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

1213132020 is a wasteful number, since it uses less digits than its factorization.

1213132020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20218879 (or 20218877 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1213132020 is about 34830.0447889462. The cubic root of 1213132020 is about 1066.5208626663.

Adding to 1213132020 its reverse (202313121), we get a palindrome (1415445141).

The spelling of 1213132020 in words is "one billion, two hundred thirteen million, one hundred thirty-two thousand, twenty".