20541557001 has 96 divisors (see below), whose sum is σ = 35145707520. Its totient is φ = 10597910400.

The previous prime is 20541556999. The next prime is 20541557009. The reversal of 20541557001 is 10075514502.

It is not a de Polignac number, because 20541557001 - 2¹ = 20541556999 is a prime.

It is a super-2 number, since 2×20541557001² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20541557001.

It is not an unprimeable number, because it can be changed into a prime (20541557009) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5799291 + ... + 5802831.

It is an arithmetic number, because the mean of its divisors is an integer number (366101120).

Almost surely, 2^20541557001 is an apocalyptic number.

20541557001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20541557001 is a deficient number, since it is larger than the sum of its proper divisors (14604150519).

20541557001 is a wasteful number, since it uses less digits than its factorization.

20541557001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3675 (or 3668 counting only the distinct ones).

The product of its (nonzero) digits is 7000, while the sum is 30.

The spelling of 20541557001 in words is "twenty billion, five hundred forty-one million, five hundred fifty-seven thousand, one".