20120665260 has 48 divisors (see below), whose sum is σ = 56384973792. Its totient is φ = 5361024000.

The previous prime is 20120665249. The next prime is 20120665261. The reversal of 20120665260 is 6256602102.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (20120665261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67551 + ... + 211670.

It is an arithmetic number, because the mean of its divisors is an integer number (1174686954).

Almost surely, 2^20120665260 is an apocalyptic number.

20120665260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20120665260 is an abundant number, since it is smaller than the sum of its proper divisors (36264308532).

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

20120665260 is a wasteful number, since it uses less digits than its factorization.

20120665260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280434 (or 280432 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The spelling of 20120665260 in words is "twenty billion, one hundred twenty million, six hundred sixty-five thousand, two hundred sixty".