20106420 has 24 divisors (see below), whose sum is σ = 56298144. Its totient is φ = 5361696.

The previous prime is 20106409. The next prime is 20106421. The reversal of 20106420 is 2460102.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20106420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20106421) 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, 167494 + ... + 167613.

It is an arithmetic number, because the mean of its divisors is an integer number (2345756).

Almost surely, 2^20106420 is an apocalyptic number.

20106420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20106420 is an abundant number, since it is smaller than the sum of its proper divisors (36191724).

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

20106420 is a wasteful number, since it uses less digits than its factorization.

20106420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335119 (or 335117 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 20106420 is about 4484.0182872062. The cubic root of 20106420 is about 271.9223574526.

Adding to 20106420 its reverse (2460102), we get a palindrome (22566522).

The spelling of 20106420 in words is "twenty million, one hundred six thousand, four hundred twenty".