20111023001 has 4 divisors (see below), whose sum is σ = 21294024372. Its totient is φ = 18928021632.

The previous prime is 20111022989. The next prime is 20111023027. The reversal of 20111023001 is 10032011102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11198718976 + 8912304025 = 105824^2 + 94405^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20111023001 is a prime.

It is a super-2 number, since 2×20111023001² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20111023301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 591500660 + ... + 591500693.

It is an arithmetic number, because the mean of its divisors is an integer number (5323506093).

Almost surely, 2^20111023001 is an apocalyptic number.

It is an amenable number.

20111023001 is a deficient number, since it is larger than the sum of its proper divisors (1183001371).

20111023001 is a wasteful number, since it uses less digits than its factorization.

20111023001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1183001370.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 20111023001 its reverse (10032011102), we get a palindrome (30143034103).

The spelling of 20111023001 in words is "twenty billion, one hundred eleven million, twenty-three thousand, one".