20923340 has 24 divisors (see below), whose sum is σ = 44770320. Its totient is φ = 8211008.

The previous prime is 20923337. The next prime is 20923349. The reversal of 20923340 is 4332902.

It is a plaindrome in base 13.

It is a zygodrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (20923349) 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, 8810 + ... + 10929.

It is an arithmetic number, because the mean of its divisors is an integer number (1865430).

Almost surely, 2^20923340 is an apocalyptic number.

20923340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20923340 is an abundant number, since it is smaller than the sum of its proper divisors (23846980).

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

20923340 is a wasteful number, since it uses less digits than its factorization.

20923340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19801 (or 19799 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 20923340 is about 4574.2037558465. The cubic root of 20923340 is about 275.5562954031.

The spelling of 20923340 in words is "twenty million, nine hundred twenty-three thousand, three hundred forty".