20542000 has 40 divisors (see below), whose sum is σ = 49675392. Its totient is φ = 8216000.

The previous prime is 20541977. The next prime is 20542009. The reversal of 20542000 is 24502.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (20542009) by changing a digit.

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, 3136 + ... + 7135.

Almost surely, 2^20542000 is an apocalyptic number.

20542000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20542000 is an abundant number, since it is smaller than the sum of its proper divisors (29133392).

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

20542000 is a wasteful number, since it uses less digits than its factorization.

20542000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10294 (or 10278 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 13.

The square root of 20542000 is about 4532.3283199698. The cubic root of 20542000 is about 273.8719631960.

Adding to 20542000 its reverse (24502), we get a palindrome (20566502).

The spelling of 20542000 in words is "twenty million, five hundred forty-two thousand".