20401023243 has 8 divisors (see below), whose sum is σ = 27833954368. Its totient is φ = 13284387144.

The previous prime is 20401023239. The next prime is 20401023271. The reversal of 20401023243 is 34232010402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20401023243 - 2² = 20401023239 is a prime.

It is a super-2 number, since 2×20401023243² (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 (20401023233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79073605 + ... + 79073862.

It is an arithmetic number, because the mean of its divisors is an integer number (3479244296).

Almost surely, 2^20401023243 is an apocalyptic number.

20401023243 is a deficient number, since it is larger than the sum of its proper divisors (7432931125).

20401023243 is a wasteful number, since it uses less digits than its factorization.

20401023243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158147513.

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 20401023243 its reverse (34232010402), we get a palindrome (54633033645).

The spelling of 20401023243 in words is "twenty billion, four hundred one million, twenty-three thousand, two hundred forty-three".