56021420 has 48 divisors (see below), whose sum is σ = 144798528. Its totient is φ = 17729280.

The previous prime is 56021411. The next prime is 56021423. The reversal of 56021420 is 2412065.

It is a happy number.

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 = 56021392 and 56021401.

It is not an unprimeable number, because it can be changed into a prime (56021423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13571 + ... + 17210.

It is an arithmetic number, because the mean of its divisors is an integer number (3016636).

Almost surely, 2^56021420 is an apocalyptic number.

It is an amenable number.

56021420 is an abundant number, since it is smaller than the sum of its proper divisors (88777108).

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

56021420 is a wasteful number, since it uses less digits than its factorization.

56021420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30810 (or 30808 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 56021420 is about 7484.7458206675. The cubic root of 56021420 is about 382.6350100815.

Adding to 56021420 its reverse (2412065), we get a palindrome (58433485).

The spelling of 56021420 in words is "fifty-six million, twenty-one thousand, four hundred twenty".