20017420 has 24 divisors (see below), whose sum is σ = 42134400. Its totient is φ = 7988352.

The previous prime is 20017409. The next prime is 20017421. The reversal of 20017420 is 2471002.

It is a junction number, because it is equal to n+sod(n) for n = 20017394 and 20017403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20017421) 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, 10501 + ... + 12259.

It is an arithmetic number, because the mean of its divisors is an integer number (1755600).

Almost surely, 2^20017420 is an apocalyptic number.

20017420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20017420 is an abundant number, since it is smaller than the sum of its proper divisors (22116980).

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

20017420 is a wasteful number, since it uses less digits than its factorization.

20017420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2337 (or 2335 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 16.

The square root of 20017420 is about 4474.0831462994. The cubic root of 20017420 is about 271.5205473813.

Adding to 20017420 its reverse (2471002), we get a palindrome (22488422).

The spelling of 20017420 in words is "twenty million, seventeen thousand, four hundred twenty".