1205615020 has 24 divisors (see below), whose sum is σ = 2538978624. Its totient is φ = 480877056.

The previous prime is 1205614987. The next prime is 1205615053. The reversal of 1205615020 is 205165021.

It is an interprime number because it is at equal distance from previous prime (1205614987) and next prime (1205615053).

It is a junction number, because it is equal to n+sod(n) for n = 1205614982 and 1205615000.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78324 + ... + 92443.

It is an arithmetic number, because the mean of its divisors is an integer number (105790776).

Almost surely, 2^1205615020 is an apocalyptic number.

1205615020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1205615020 is an abundant number, since it is smaller than the sum of its proper divisors (1333363604).

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

1205615020 is a wasteful number, since it uses less digits than its factorization.

1205615020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171129 (or 171127 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 1205615020 is about 34721.9673981760. The cubic root of 1205615020 is about 1064.3134487872.

It can be divided in two parts, 1205 and 615020, that added together give a square (616225 = 785²).

The spelling of 1205615020 in words is "one billion, two hundred five million, six hundred fifteen thousand, twenty".