1205051420 has 36 divisors (see below), whose sum is σ = 2645441400. Its totient is φ = 461059104.

The previous prime is 1205051399. The next prime is 1205051447. The reversal of 1205051420 is 241505021.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1205051392 and 1205051401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46370 + ... + 67529.

Almost surely, 2^1205051420 is an apocalyptic number.

1205051420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1205051420 is an abundant number, since it is smaller than the sum of its proper divisors (1440389980).

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

1205051420 is a wasteful number, since it uses less digits than its factorization.

1205051420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113954 (or 113929 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 1205051420 is about 34713.8505498886. The cubic root of 1205051420 is about 1064.1475747876.

Adding to 1205051420 its reverse (241505021), we get a palindrome (1446556441).

The spelling of 1205051420 in words is "one billion, two hundred five million, fifty-one thousand, four hundred twenty".