20151420 has 24 divisors (see below), whose sum is σ = 56424144. Its totient is φ = 5373696.

The previous prime is 20151407. The next prime is 20151449. The reversal of 20151420 is 2415102.

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 20151420.

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, 167869 + ... + 167988.

It is an arithmetic number, because the mean of its divisors is an integer number (2351006).

Almost surely, 2^20151420 is an apocalyptic number.

20151420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20151420 is an abundant number, since it is smaller than the sum of its proper divisors (36272724).

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

20151420 is a wasteful number, since it uses less digits than its factorization.

20151420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335869 (or 335867 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 20151420 is about 4489.0333035076. The cubic root of 20151420 is about 272.1250686366.

Adding to 20151420 its reverse (2415102), we get a palindrome (22566522).

The spelling of 20151420 in words is "twenty million, one hundred fifty-one thousand, four hundred twenty".