20546421 has 32 divisors (see below), whose sum is σ = 33684480. Its totient is φ = 10872576.

The previous prime is 20546411. The next prime is 20546431. The reversal of 20546421 is 12464502.

It is an interprime number because it is at equal distance from previous prime (20546411) and next prime (20546431).

It is not a de Polignac number, because 20546421 - 2¹³ = 20538229 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20546391 and 20546400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20546411) 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 31 ways as a sum of consecutive naturals, for example, 23490 + ... + 24348.

It is an arithmetic number, because the mean of its divisors is an integer number (1052640).

Almost surely, 2^20546421 is an apocalyptic number.

20546421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20546421 is a deficient number, since it is larger than the sum of its proper divisors (13138059).

20546421 is a wasteful number, since it uses less digits than its factorization.

20546421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 953.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 20546421 is about 4532.8160121496. The cubic root of 20546421 is about 273.8916091425.

The spelling of 20546421 in words is "twenty million, five hundred forty-six thousand, four hundred twenty-one".