20415123 has 24 divisors (see below), whose sum is σ = 30371328. Its totient is φ = 13208832.

The previous prime is 20415119. The next prime is 20415133. The reversal of 20415123 is 32151402.

It is not a de Polignac number, because 20415123 - 2² = 20415119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20415096 and 20415105.

It is not an unprimeable number, because it can be changed into a prime (20415103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60411 + ... + 60747.

It is an arithmetic number, because the mean of its divisors is an integer number (1265472).

Almost surely, 2^20415123 is an apocalyptic number.

20415123 is a deficient number, since it is larger than the sum of its proper divisors (9956205).

20415123 is a wasteful number, since it uses less digits than its factorization.

20415123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523 (or 520 counting only the distinct ones).

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

The square root of 20415123 is about 4518.3097503381. The cubic root of 20415123 is about 273.3069445408.

Adding to 20415123 its reverse (32151402), we get a palindrome (52566525).

The spelling of 20415123 in words is "twenty million, four hundred fifteen thousand, one hundred twenty-three".