20265021123 has 32 divisors (see below), whose sum is σ = 28125081600. Its totient is φ = 12969966240.

The previous prime is 20265021059. The next prime is 20265021149. The reversal of 20265021123 is 32112056202.

It is not a de Polignac number, because 20265021123 - 2⁶ = 20265021059 is a prime.

It is a super-2 number, since 2×20265021123² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20265021093 and 20265021102.

It is not an unprimeable number, because it can be changed into a prime (20265021523) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2125938 + ... + 2135448.

It is an arithmetic number, because the mean of its divisors is an integer number (878908800).

Almost surely, 2^20265021123 is an apocalyptic number.

20265021123 is a deficient number, since it is larger than the sum of its proper divisors (7860060477).

20265021123 is a wasteful number, since it uses less digits than its factorization.

20265021123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9839.

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 20265021123 its reverse (32112056202), we get a palindrome (52377077325).

The spelling of 20265021123 in words is "twenty billion, two hundred sixty-five million, twenty-one thousand, one hundred twenty-three".