20347872 has 48 divisors (see below), whose sum is σ = 54109440. Its totient is φ = 6694272.

The previous prime is 20347867. The next prime is 20347883. The reversal of 20347872 is 27874302.

It is a tau number, because it is divible by the number of its divisors (48).

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, 6243 + ... + 8925.

It is an arithmetic number, because the mean of its divisors is an integer number (1127280).

Almost surely, 2^20347872 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 20347872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27054720).

20347872 is an abundant number, since it is smaller than the sum of its proper divisors (33761568).

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

20347872 is a wasteful number, since it uses less digits than its factorization.

20347872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2775 (or 2767 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 33.

The square root of 20347872 is about 4510.8615585052. The cubic root of 20347872 is about 273.0065073789.

The spelling of 20347872 in words is "twenty million, three hundred forty-seven thousand, eight hundred seventy-two".