20556498 has 16 divisors (see below), whose sum is σ = 42116256. Its totient is φ = 6684960.

The previous prime is 20556493. The next prime is 20556517. The reversal of 20556498 is 89465502.

It is a super-2 number, since 2×20556498² = 845139220048008, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20556491) 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 7 ways as a sum of consecutive naturals, for example, 41536 + ... + 42027.

It is an arithmetic number, because the mean of its divisors is an integer number (2632266).

Almost surely, 2^20556498 is an apocalyptic number.

20556498 is an abundant number, since it is smaller than the sum of its proper divisors (21559758).

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

20556498 is a wasteful number, since it uses less digits than its factorization.

20556498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83609.

The product of its (nonzero) digits is 86400, while the sum is 39.

The square root of 20556498 is about 4533.9274365609. The cubic root of 20556498 is about 273.9363785722.

The spelling of 20556498 in words is "twenty million, five hundred fifty-six thousand, four hundred ninety-eight".