20023115021551 has 8 divisors (see below), whose sum is σ = 21077188809200. Its totient is φ = 18969063796800.

The previous prime is 20023115021423. The next prime is 20023115021557. The reversal of 20023115021551 is 15512051132002.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20023115021551 - 2⁷ = 20023115021423 is a prime.

It is a super-2 number, since 2×20023115021551² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20023115021557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3803796 + ... + 7383433.

It is an arithmetic number, because the mean of its divisors is an integer number (2634648601150).

Almost surely, 2^{20023115021551} is an apocalyptic number.

20023115021551 is a deficient number, since it is larger than the sum of its proper divisors (1054073787649).

20023115021551 is a wasteful number, since it uses less digits than its factorization.

20023115021551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11281449.

The product of its (nonzero) digits is 3000, while the sum is 28.

Adding to 20023115021551 its reverse (15512051132002), we get a palindrome (35535166153553).

The spelling of 20023115021551 in words is "twenty trillion, twenty-three billion, one hundred fifteen million, twenty-one thousand, five hundred fifty-one".