20180420 has 24 divisors (see below), whose sum is σ = 45639384. Its totient is φ = 7451136.

The previous prime is 20180399. The next prime is 20180441. The reversal of 20180420 is 2408102.

It is an interprime number because it is at equal distance from previous prime (20180399) and next prime (20180441).

It can be written as a sum of positive squares in 4 ways, for example, as 749956 + 19430464 = 866^2 + 4408^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38549 + ... + 39068.

It is an arithmetic number, because the mean of its divisors is an integer number (1901641).

Almost surely, 2^20180420 is an apocalyptic number.

20180420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20180420 is an abundant number, since it is smaller than the sum of its proper divisors (25458964).

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

20180420 is a wasteful number, since it uses less digits than its factorization.

20180420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77639 (or 77637 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 20180420 is about 4492.2622363348. The cubic root of 20180420 is about 272.2555448742.

Adding to 20180420 its reverse (2408102), we get a palindrome (22588522).

The spelling of 20180420 in words is "twenty million, one hundred eighty thousand, four hundred twenty".