20956040 has 32 divisors (see below), whose sum is σ = 53887680. Its totient is φ = 7184832.

The previous prime is 20956021. The next prime is 20956051. The reversal of 20956040 is 4065902.

It is a super-2 number, since 2×20956040² = 878311224963200, which contains 22 as substring.

It is an unprimeable number.

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, 37142 + ... + 37701.

It is an arithmetic number, because the mean of its divisors is an integer number (1683990).

Almost surely, 2^20956040 is an apocalyptic number.

20956040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20956040 is an abundant number, since it is smaller than the sum of its proper divisors (32931640).

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

20956040 is a wasteful number, since it uses less digits than its factorization.

20956040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74861 (or 74857 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 20956040 is about 4577.7767529664. The cubic root of 20956040 is about 275.6997715533.

The spelling of 20956040 in words is "twenty million, nine hundred fifty-six thousand, forty".