20913772 has 24 divisors (see below), whose sum is σ = 40903632. Its totient is φ = 9273600.

The previous prime is 20913719. The next prime is 20913773. The reversal of 20913772 is 27731902.

It is not an unprimeable number, because it can be changed into a prime (20913773) 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, 3993 + ... + 7600.

It is an arithmetic number, because the mean of its divisors is an integer number (1704318).

Almost surely, 2^20913772 is an apocalyptic number.

20913772 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20913772 is a deficient number, since it is larger than the sum of its proper divisors (19989860).

20913772 is a wasteful number, since it uses less digits than its factorization.

20913772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11649 (or 11647 counting only the distinct ones).

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 20913772 is about 4573.1577711686. The cubic root of 20913772 is about 275.5142861028.

The spelling of 20913772 in words is "twenty million, nine hundred thirteen thousand, seven hundred seventy-two".