20123420 has 12 divisors (see below), whose sum is σ = 42259224. Its totient is φ = 8049360.

The previous prime is 20123417. The next prime is 20123431. The reversal of 20123420 is 2432102.

It is a junction number, because it is equal to n+sod(n) for n = 20123395 and 20123404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 503066 + ... + 503105.

It is an arithmetic number, because the mean of its divisors is an integer number (3521602).

Almost surely, 2^20123420 is an apocalyptic number.

20123420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20123420 is an abundant number, since it is smaller than the sum of its proper divisors (22135804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20123420 is a wasteful number, since it uses less digits than its factorization.

20123420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1006180 (or 1006178 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 20123420 is about 4485.9135078599. The cubic root of 20123420 is about 271.9989727470.

Adding to 20123420 its reverse (2432102), we get a palindrome (22555522).

The spelling of 20123420 in words is "twenty million, one hundred twenty-three thousand, four hundred twenty".