1687220020 has 48 divisors (see below), whose sum is σ = 3618639360. Its totient is φ = 660573056.

The previous prime is 1687219973. The next prime is 1687220023. The reversal of 1687220020 is 200227861.

It is a super-2 number, since 2×1687220020² = 5693422791777600800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1687220023) 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, 506079 + ... + 509401.

It is an arithmetic number, because the mean of its divisors is an integer number (75388320).

Almost surely, 2^1687220020 is an apocalyptic number.

1687220020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1687220020 is an abundant number, since it is smaller than the sum of its proper divisors (1931419340).

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

1687220020 is a wasteful number, since it uses less digits than its factorization.

1687220020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3864 (or 3862 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 1687220020 is about 41075.7838634882. The cubic root of 1687220020 is about 1190.4849422905.

Adding to 1687220020 its reverse (200227861), we get a palindrome (1887447881).

The spelling of 1687220020 in words is "one billion, six hundred eighty-seven million, two hundred twenty thousand, twenty".