20871948 has 48 divisors (see below), whose sum is σ = 51932160. Its totient is φ = 6509184.

The previous prime is 20871923. The next prime is 20871973. The reversal of 20871948 is 84917802.

It is an interprime number because it is at equal distance from previous prime (20871923) and next prime (20871973).

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12168 + ... + 13776.

It is an arithmetic number, because the mean of its divisors is an integer number (1081920).

Almost surely, 2^20871948 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20871948, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25966080).

20871948 is an abundant number, since it is smaller than the sum of its proper divisors (31060212).

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

20871948 is a wasteful number, since it uses less digits than its factorization.

20871948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1686 (or 1684 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 20871948 is about 4568.5827123956. The cubic root of 20871948 is about 275.3305029085.

The spelling of 20871948 in words is "twenty million, eight hundred seventy-one thousand, nine hundred forty-eight".