20426420 has 24 divisors (see below), whose sum is σ = 49023744. Its totient is φ = 7003296.

The previous prime is 20426389. The next prime is 20426423. The reversal of 20426420 is 2462402.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 20426392 and 20426401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20426423) 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, 72812 + ... + 73091.

It is an arithmetic number, because the mean of its divisors is an integer number (2042656).

Almost surely, 2^20426420 is an apocalyptic number.

20426420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20426420 is an abundant number, since it is smaller than the sum of its proper divisors (28597324).

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

20426420 is a wasteful number, since it uses less digits than its factorization.

20426420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145919 (or 145917 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 20426420 is about 4519.5597130694. The cubic root of 20426420 is about 273.3573480123.

Adding to 20426420 its reverse (2462402), we get a palindrome (22888822).

The spelling of 20426420 in words is "twenty million, four hundred twenty-six thousand, four hundred twenty".