20256940 has 24 divisors (see below), whose sum is σ = 46407312. Its totient is φ = 7366080.

The previous prime is 20256937. The next prime is 20256949. The reversal of 20256940 is 4965202.

It is a junction number, because it is equal to n+sod(n) for n = 20256899 and 20256908.

It is not an unprimeable number, because it can be changed into a prime (20256949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45819 + ... + 46258.

It is an arithmetic number, because the mean of its divisors is an integer number (1933638).

Almost surely, 2^20256940 is an apocalyptic number.

20256940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20256940 is an abundant number, since it is smaller than the sum of its proper divisors (26150372).

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

20256940 is a wasteful number, since it uses less digits than its factorization.

20256940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92097 (or 92095 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 20256940 is about 4500.7710450544. The cubic root of 20256940 is about 272.5992231879.

The spelling of 20256940 in words is "twenty million, two hundred fifty-six thousand, nine hundred forty".