20210420 has 24 divisors (see below), whose sum is σ = 42633864. Its totient is φ = 8047616.

The previous prime is 20210401. The next prime is 20210431. The reversal of 20210420 is 2401202.

20210420 = T₂₉ + T₃₀ + ... + T₄₉₄.

It can be written as a sum of positive squares in 4 ways, for example, as 620944 + 19589476 = 788^2 + 4426^2 .

It is a super-2 number, since 2×20210420² = 816922153152800, which contains 22 as substring.

It is a congruent number.

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, 2492 + ... + 6828.

It is an arithmetic number, because the mean of its divisors is an integer number (1776411).

Almost surely, 2^20210420 is an apocalyptic number.

20210420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20210420 is an abundant number, since it is smaller than the sum of its proper divisors (22423444).

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

20210420 is a wasteful number, since it uses less digits than its factorization.

20210420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4579 (or 4577 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 20210420 is about 4495.6000711807. The cubic root of 20210420 is about 272.3903888197.

Adding to 20210420 its reverse (2401202), we get a palindrome (22611622).

The spelling of 20210420 in words is "twenty million, two hundred ten thousand, four hundred twenty".