20543554 has 16 divisors (see below), whose sum is σ = 32332608. Its totient is φ = 9770992.

The previous prime is 20543539. The next prime is 20543569. The reversal of 20543554 is 45534502.

It is an interprime number because it is at equal distance from previous prime (20543539) and next prime (20543569).

It is a super-2 number, since 2×20543554² = 844075221901832, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7929 + ... + 10195.

It is an arithmetic number, because the mean of its divisors is an integer number (2020788).

Almost surely, 2^20543554 is an apocalyptic number.

20543554 is a deficient number, since it is larger than the sum of its proper divisors (11789054).

20543554 is a wasteful number, since it uses less digits than its factorization.

20543554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2489.

The product of its (nonzero) digits is 12000, while the sum is 28.

The square root of 20543554 is about 4532.4997517926. The cubic root of 20543554 is about 273.8788691496.

The spelling of 20543554 in words is "twenty million, five hundred forty-three thousand, five hundred fifty-four".