20656460 has 24 divisors (see below), whose sum is σ = 47322576. Its totient is φ = 7511360.

The previous prime is 20656451. The next prime is 20656463. The reversal of 20656460 is 6465602.

It is not an unprimeable number, because it can be changed into a prime (20656463) 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, 46727 + ... + 47166.

It is an arithmetic number, because the mean of its divisors is an integer number (1971774).

Almost surely, 2^20656460 is an apocalyptic number.

20656460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20656460 is an abundant number, since it is smaller than the sum of its proper divisors (26666116).

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

20656460 is a wasteful number, since it uses less digits than its factorization.

20656460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93913 (or 93911 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 20656460 is about 4544.9378433594. The cubic root of 20656460 is about 274.3796927572.

The spelling of 20656460 in words is "twenty million, six hundred fifty-six thousand, four hundred sixty".