20149518601 has 27 divisors (see below), whose sum is σ = 22065515559. Its totient is φ = 18396590400.

The previous prime is 20149518581. The next prime is 20149518607. The reversal of 20149518601 is 10681594102.

The square root of 20149518601 is 141949.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 15153856201 + 4995662400 = 123101^2 + 70680^2 .

It is not a de Polignac number, because 20149518601 - 2⁵ = 20149518569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20149518607) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 83607841 + ... + 83608081.

It is an arithmetic number, because the mean of its divisors is an integer number (817241317).

Almost surely, 2^20149518601 is an apocalyptic number.

20149518601 is the 141949-th square number.

20149518601 is the 70975-th centered octagonal number.

It is an amenable number.

20149518601 is a deficient number, since it is larger than the sum of its proper divisors (1915996958).

20149518601 is an frugal number, since it uses more digits than its factorization.

20149518601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582 (or 291 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 37.

The spelling of 20149518601 in words is "twenty billion, one hundred forty-nine million, five hundred eighteen thousand, six hundred one".