20913936 has 40 divisors (see below), whose sum is σ = 55350624. Its totient is φ = 6800640.

The previous prime is 20913931. The next prime is 20913941. The reversal of 20913936 is 63931902.

It is an interprime number because it is at equal distance from previous prime (20913931) and next prime (20913941).

It is a junction number, because it is equal to n+sod(n) for n = 20913897 and 20913906.

It is not an unprimeable number, because it can be changed into a prime (20913931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3346 + ... + 7281.

Almost surely, 2^20913936 is an apocalyptic number.

It is an amenable number.

20913936 is an abundant number, since it is smaller than the sum of its proper divisors (34436688).

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

20913936 is a wasteful number, since it uses less digits than its factorization.

20913936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10679 (or 10673 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 33.

The square root of 20913936 is about 4573.1757018510. The cubic root of 20913936 is about 275.5150062698.

The spelling of 20913936 in words is "twenty million, nine hundred thirteen thousand, nine hundred thirty-six".