20856654 has 144 divisors (see below), whose sum is σ = 60501168. Its totient is φ = 5128704.

The previous prime is 20856629. The next prime is 20856679. The reversal of 20856654 is 45665802.

It is an interprime number because it is at equal distance from previous prime (20856629) and next prime (20856679).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 194869 + ... + 194975.

It is an arithmetic number, because the mean of its divisors is an integer number (420147).

Almost surely, 2^20856654 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20856654, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30250584).

20856654 is an abundant number, since it is smaller than the sum of its proper divisors (39644514).

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

20856654 is a wasteful number, since it uses less digits than its factorization.

20856654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159 (or 149 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The square root of 20856654 is about 4566.9085824001. The cubic root of 20856654 is about 275.2632366484.

The spelling of 20856654 in words is "twenty million, eight hundred fifty-six thousand, six hundred fifty-four".