140640020 has 24 divisors (see below), whose sum is σ = 296205000. Its totient is φ = 56092032.

The previous prime is 140640013. The next prime is 140640037. The reversal of 140640020 is 20046041.

140640020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 23697424 + 116942596 = 4868^2 + 10814^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3095 + ... + 17054.

It is an arithmetic number, because the mean of its divisors is an integer number (12341875).

Almost surely, 2^140640020 is an apocalyptic number.

140640020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

140640020 is an abundant number, since it is smaller than the sum of its proper divisors (155564980).

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

140640020 is a wasteful number, since it uses less digits than its factorization.

140640020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20507 (or 20505 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 140640020 is about 11859.1745075279. The cubic root of 140640020 is about 520.0394693907.

Adding to 140640020 its reverse (20046041), we get a palindrome (160686061).

The spelling of 140640020 in words is "one hundred forty million, six hundred forty thousand, twenty".