197731920 has 160 divisors (see below), whose sum is σ = 647315712. Its totient is φ = 49831936.

The previous prime is 197731903. The next prime is 197731921. The reversal of 197731920 is 29137791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197731921) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 623602 + ... + 623918.

Almost surely, 2^197731920 is an apocalyptic number.

197731920 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 197731920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (323657856).

197731920 is an abundant number, since it is smaller than the sum of its proper divisors (449583792).

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

197731920 is a wasteful number, since it uses less digits than its factorization.

197731920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469 (or 463 counting only the distinct ones).

The product of its (nonzero) digits is 23814, while the sum is 39.

The square root of 197731920 is about 14061.7182449372. The cubic root of 197731920 is about 582.5845027130.

The spelling of 197731920 in words is "one hundred ninety-seven million, seven hundred thirty-one thousand, nine hundred twenty".