20128601240 has 32 divisors (see below), whose sum is σ = 49406567760. Its totient is φ = 7319491200.

The previous prime is 20128601231. The next prime is 20128601257. The reversal of 20128601240 is 4210682102.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22872971 + ... + 22873850.

Almost surely, 2^20128601240 is an apocalyptic number.

20128601240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20128601240 is an abundant number, since it is smaller than the sum of its proper divisors (29277966520).

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

20128601240 is a wasteful number, since it uses less digits than its factorization.

20128601240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45746843 (or 45746839 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The spelling of 20128601240 in words is "twenty billion, one hundred twenty-eight million, six hundred one thousand, two hundred forty".