20940140 has 48 divisors (see below), whose sum is σ = 48484128. Its totient is φ = 7547904.

The previous prime is 20940137. The next prime is 20940149. The reversal of 20940140 is 4104902.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (20940149) 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, 10244 + ... + 12116.

It is an arithmetic number, because the mean of its divisors is an integer number (1010086).

Almost surely, 2^20940140 is an apocalyptic number.

20940140 is a gapful number since it is divisible by the number (20) 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 20940140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24242064).

20940140 is an abundant number, since it is smaller than the sum of its proper divisors (27543988).

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

20940140 is a wasteful number, since it uses less digits than its factorization.

20940140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1938 (or 1936 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 20940140 is about 4576.0397725544. The cubic root of 20940140 is about 275.6300265776.

The spelling of 20940140 in words is "twenty million, nine hundred forty thousand, one hundred forty".