20973552 has 40 divisors (see below), whose sum is σ = 54877440. Its totient is φ = 6901440.

The previous prime is 20973527. The next prime is 20973553. The reversal of 20973552 is 25537902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20973553) 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, 1027 + ... + 6557.

It is an arithmetic number, because the mean of its divisors is an integer number (1371936).

Almost surely, 2^20973552 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 20973552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27438720).

20973552 is an abundant number, since it is smaller than the sum of its proper divisors (33903888).

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

20973552 is a wasteful number, since it uses less digits than its factorization.

20973552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5621 (or 5615 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 33.

The square root of 20973552 is about 4579.6890724153. The cubic root of 20973552 is about 275.7765467163.

The spelling of 20973552 in words is "twenty million, nine hundred seventy-three thousand, five hundred fifty-two".