20151897389250 has 128 divisors (see below), whose sum is σ = 54887771577600. Its totient is φ = 4883885120000.

The previous prime is 20151897389231. The next prime is 20151897389257. The reversal of 20151897389250 is 5298379815102.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20151897389257) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 28100140 + ... + 28808360.

It is an arithmetic number, because the mean of its divisors is an integer number (428810715450).

Almost surely, 2^{20151897389250} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20151897389250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27443885788800).

20151897389250 is an abundant number, since it is smaller than the sum of its proper divisors (34735874188350).

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

20151897389250 is a wasteful number, since it uses less digits than its factorization.

20151897389250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711701 (or 711691 counting only the distinct ones).

The product of its (nonzero) digits is 10886400, while the sum is 60.

The spelling of 20151897389250 in words is "twenty trillion, one hundred fifty-one billion, eight hundred ninety-seven million, three hundred eighty-nine thousand, two hundred fifty".