20123124251 has 8 divisors (see below), whose sum is σ = 20706528624. Its totient is φ = 19541800800.

The previous prime is 20123124239. The next prime is 20123124253. The reversal of 20123124251 is 15242132102.

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 20123124251 - 2¹⁴ = 20123107867 is a prime.

It is a super-2 number, since 2×20123124251² (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 (20123124253) 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, 500600 + ... + 539301.

It is an arithmetic number, because the mean of its divisors is an integer number (2588316078).

Almost surely, 2^20123124251 is an apocalyptic number.

20123124251 is a deficient number, since it is larger than the sum of its proper divisors (583404373).

20123124251 is a wasteful number, since it uses less digits than its factorization.

20123124251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040461.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 20123124251 its reverse (15242132102), we get a palindrome (35365256353).

The spelling of 20123124251 in words is "twenty billion, one hundred twenty-three million, one hundred twenty-four thousand, two hundred fifty-one".