20956540 has 24 divisors (see below), whose sum is σ = 48010032. Its totient is φ = 7620480.

The previous prime is 20956511. The next prime is 20956583. The reversal of 20956540 is 4565902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47409 + ... + 47848.

It is an arithmetic number, because the mean of its divisors is an integer number (2000418).

Almost surely, 2^20956540 is an apocalyptic number.

20956540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20956540 is an abundant number, since it is smaller than the sum of its proper divisors (27053492).

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

20956540 is a wasteful number, since it uses less digits than its factorization.

20956540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95277 (or 95275 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 20956540 is about 4577.8313643034. The cubic root of 20956540 is about 275.7019642193.

The spelling of 20956540 in words is "twenty million, nine hundred fifty-six thousand, five hundred forty".