1631432220 has 96 divisors (see below), whose sum is σ = 5077416960. Its totient is φ = 388028160.

The previous prime is 1631432191. The next prime is 1631432261. The reversal of 1631432220 is 222341361.

1631432220 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11661 + ... + 58299.

It is an arithmetic number, because the mean of its divisors is an integer number (52889760).

Almost surely, 2^1631432220 is an apocalyptic number.

1631432220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1631432220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2538708480).

1631432220 is an abundant number, since it is smaller than the sum of its proper divisors (3445984740).

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

1631432220 is a wasteful number, since it uses less digits than its factorization.

1631432220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46715 (or 46713 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 1631432220 is about 40390.9918174833. The cubic root of 1631432220 is about 1177.2165120982.

Adding to 1631432220 its reverse (222341361), we get a palindrome (1853773581).

The spelling of 1631432220 in words is "one billion, six hundred thirty-one million, four hundred thirty-two thousand, two hundred twenty".