20936940 has 24 divisors (see below), whose sum is σ = 58623600. Its totient is φ = 5583168.

The previous prime is 20936933. The next prime is 20936947. The reversal of 20936940 is 4963902.

It is an interprime number because it is at equal distance from previous prime (20936933) and next prime (20936947).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20936947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 174415 + ... + 174534.

It is an arithmetic number, because the mean of its divisors is an integer number (2442650).

Almost surely, 2^20936940 is an apocalyptic number.

20936940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20936940 is an abundant number, since it is smaller than the sum of its proper divisors (37686660).

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

20936940 is a wasteful number, since it uses less digits than its factorization.

20936940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348961 (or 348959 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 20936940 is about 4575.6901118848. The cubic root of 20936940 is about 275.6159855856.

The spelling of 20936940 in words is "twenty million, nine hundred thirty-six thousand, nine hundred forty".