1656142020 has 72 divisors (see below), whose sum is σ = 5410071576. Its totient is φ = 407665152.

The previous prime is 1656142001. The next prime is 1656142027. The reversal of 1656142020 is 202416561.

1656142020 is a `hidden beast` number, since 1 + 6 + 5 + 614 + 20 + 20 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 21233664 + 1634908356 = 4608^2 + 40434^2 .

It is not an unprimeable number, because it can be changed into a prime (1656142027) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 351537 + ... + 356216.

It is an arithmetic number, because the mean of its divisors is an integer number (75139883).

Almost surely, 2^1656142020 is an apocalyptic number.

1656142020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1656142020 is an abundant number, since it is smaller than the sum of its proper divisors (3753929556).

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

1656142020 is a wasteful number, since it uses less digits than its factorization.

1656142020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707781 (or 707776 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 1656142020 is about 40695.7248368917. The cubic root of 1656142020 is about 1183.1301600970.

Adding to 1656142020 its reverse (202416561), we get a palindrome (1858558581).

The spelling of 1656142020 in words is "one billion, six hundred fifty-six million, one hundred forty-two thousand, twenty".