1213402020 has 24 divisors (see below), whose sum is σ = 3397525824. Its totient is φ = 323573856.

The previous prime is 1213402019. The next prime is 1213402027. The reversal of 1213402020 is 202043121.

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

It is not an unprimeable number, because it can be changed into a prime (1213402027) 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, 10111624 + ... + 10111743.

It is an arithmetic number, because the mean of its divisors is an integer number (141563576).

Almost surely, 2^1213402020 is an apocalyptic number.

1213402020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213402020 is an abundant number, since it is smaller than the sum of its proper divisors (2184123804).

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

1213402020 is a wasteful number, since it uses less digits than its factorization.

1213402020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20223379 (or 20223377 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 1213402020 is about 34833.9205373153. The cubic root of 1213402020 is about 1066.5999799889.

Adding to 1213402020 its reverse (202043121), we get a palindrome (1415445141).

The spelling of 1213402020 in words is "one billion, two hundred thirteen million, four hundred two thousand, twenty".