20997054 has 48 divisors (see below), whose sum is σ = 49830144. Its totient is φ = 6350400.

The previous prime is 20997047. The next prime is 20997059. The reversal of 20997054 is 45079902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20997059) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13539 + ... + 15009.

It is an arithmetic number, because the mean of its divisors is an integer number (1038128).

Almost surely, 2^20997054 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20997054, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24915072).

20997054 is an abundant number, since it is smaller than the sum of its proper divisors (28833090).

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

20997054 is a wasteful number, since it uses less digits than its factorization.

20997054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1553 (or 1550 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 20997054 is about 4582.2542487295. The cubic root of 20997054 is about 275.8795157798.

The spelling of 20997054 in words is "twenty million, nine hundred ninety-seven thousand, fifty-four".