20318420 has 48 divisors (see below), whose sum is σ = 44210880. Its totient is φ = 7839744.

The previous prime is 20318413. The next prime is 20318437. The reversal of 20318420 is 2481302.

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 = 20318392 and 20318401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78932 + ... + 79188.

It is an arithmetic number, because the mean of its divisors is an integer number (921060).

Almost surely, 2^20318420 is an apocalyptic number.

20318420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20318420 is an abundant number, since it is smaller than the sum of its proper divisors (23892460).

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

20318420 is a wasteful number, since it uses less digits than its factorization.

20318420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392 (or 390 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 20318420 is about 4507.5958115164. The cubic root of 20318420 is about 272.8747250454.

Adding to 20318420 its reverse (2481302), we get a palindrome (22799722).

The spelling of 20318420 in words is "twenty million, three hundred eighteen thousand, four hundred twenty".