140020660 has 48 divisors (see below), whose sum is σ = 319156992. Its totient is φ = 51292800.

The previous prime is 140020631. The next prime is 140020663. The reversal of 140020660 is 66020041.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140020663) 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, 32005 + ... + 36115.

It is an arithmetic number, because the mean of its divisors is an integer number (6649104).

Almost surely, 2^140020660 is an apocalyptic number.

140020660 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 140020660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (159578496).

140020660 is an abundant number, since it is smaller than the sum of its proper divisors (179136332).

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

140020660 is a wasteful number, since it uses less digits than its factorization.

140020660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4264 (or 4262 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 140020660 is about 11833.0325783376. The cubic root of 140020660 is about 519.2749510545.

The spelling of 140020660 in words is "one hundred forty million, twenty thousand, six hundred sixty".