20106251145 has 48 divisors (see below), whose sum is σ = 36127166400. Its totient is φ = 10332147840.

The previous prime is 20106251111. The next prime is 20106251147. The reversal of 20106251145 is 54115260102.

20106251145 is a `hidden beast` number, since 2 + 0 + 106 + 2 + 511 + 45 = 666.

It is not a de Polignac number, because 20106251145 - 2⁷ = 20106251017 is a prime.

It is a super-2 number, since 2×20106251145² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20106251147) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 625066 + ... + 656444.

It is an arithmetic number, because the mean of its divisors is an integer number (752649300).

Almost surely, 2^20106251145 is an apocalyptic number.

It is an amenable number.

20106251145 is a deficient number, since it is larger than the sum of its proper divisors (16020915255).

20106251145 is a wasteful number, since it uses less digits than its factorization.

20106251145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31910 (or 31907 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The spelling of 20106251145 in words is "twenty billion, one hundred six million, two hundred fifty-one thousand, one hundred forty-five".