1361635020 has 72 divisors (see below), whose sum is σ = 4142733504. Its totient is φ = 362009088.

The previous prime is 1361634997. The next prime is 1361635021. The reversal of 1361635020 is 205361631.

1361635020 is a `hidden beast` number, since 1 + 3 + 6 + 1 + 635 + 0 + 20 = 666.

It is not an unprimeable number, because it can be changed into a prime (1361635021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49437 + ... + 71883.

Almost surely, 2^1361635020 is an apocalyptic number.

1361635020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1361635020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2071366752).

1361635020 is an abundant number, since it is smaller than the sum of its proper divisors (2781098484).

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

1361635020 is a wasteful number, since it uses less digits than its factorization.

1361635020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22799 (or 22794 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 1361635020 is about 36900.3390228328. The cubic root of 1361635020 is about 1108.3754662911.

Adding to 1361635020 its reverse (205361631), we get a palindrome (1566996651).

The spelling of 1361635020 in words is "one billion, three hundred sixty-one million, six hundred thirty-five thousand, twenty".