20451123 has 48 divisors (see below), whose sum is σ = 38228736. Its totient is φ = 10614240.

The previous prime is 20451113. The next prime is 20451127. The reversal of 20451123 is 32115402.

It is not a de Polignac number, because 20451123 - 2⁶ = 20451059 is a prime.

It is a super-2 number, since 2×20451123² = 836496863922258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20451096 and 20451105.

It is not an unprimeable number, because it can be changed into a prime (20451127) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18165 + ... + 19257.

It is an arithmetic number, because the mean of its divisors is an integer number (796432).

Almost surely, 2^20451123 is an apocalyptic number.

20451123 is a deficient number, since it is larger than the sum of its proper divisors (17777613).

20451123 is a wasteful number, since it uses less digits than its factorization.

20451123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1126 (or 1114 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 20451123 is about 4522.2917862517. The cubic root of 20451123 is about 273.4674999009.

Adding to 20451123 its reverse (32115402), we get a palindrome (52566525).

The spelling of 20451123 in words is "twenty million, four hundred fifty-one thousand, one hundred twenty-three".