20947554 has 12 divisors (see below), whose sum is σ = 45386406. Its totient is φ = 6982512.

The previous prime is 20947547. The next prime is 20947559. The reversal of 20947554 is 45574902.

It can be written as a sum of positive squares in only one way, i.e., 17867529 + 3080025 = 4227^2 + 1755^2 .

It is not an unprimeable number, because it can be changed into a prime (20947559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 581859 + ... + 581894.

Almost surely, 2^20947554 is an apocalyptic number.

20947554 is an abundant number, since it is smaller than the sum of its proper divisors (24438852).

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

20947554 is a wasteful number, since it uses less digits than its factorization.

20947554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1163761 (or 1163758 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 20947554 is about 4576.8497899756. The cubic root of 20947554 is about 275.6625523055.

The spelling of 20947554 in words is "twenty million, nine hundred forty-seven thousand, five hundred fifty-four".