1213884020 has 24 divisors (see below), whose sum is σ = 2558644200. Its totient is φ = 483746432.

The previous prime is 1213884013. The next prime is 1213884101. The reversal of 1213884020 is 204883121.

It can be written as a sum of positive squares in 4 ways, for example, as 227044624 + 986839396 = 15068^2 + 31414^2 .

It is a super-2 number, since 2×1213884020² = 2947028828022720800, which contains 22 as substring.

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, 107435 + ... + 118194.

It is an arithmetic number, because the mean of its divisors is an integer number (106610175).

Almost surely, 2^1213884020 is an apocalyptic number.

1213884020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213884020 is an abundant number, since it is smaller than the sum of its proper divisors (1344760180).

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

1213884020 is a wasteful number, since it uses less digits than its factorization.

1213884020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225907 (or 225905 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 1213884020 is about 34840.8383940456. The cubic root of 1213884020 is about 1066.7411898888.

The spelling of 1213884020 in words is "one billion, two hundred thirteen million, eight hundred eighty-four thousand, twenty".