20515542 has 8 divisors (see below), whose sum is σ = 41031096. Its totient is φ = 6838512.

The previous prime is 20515531. The next prime is 20515553. The reversal of 20515542 is 24551502.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20515531) and next prime (20515553).

It is a sphenic number, since it is the product of 3 distinct primes.

20515542 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1709623 + ... + 1709634.

It is an arithmetic number, because the mean of its divisors is an integer number (5128887).

Almost surely, 2^20515542 is an apocalyptic number.

20515542 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20515542 is a wasteful number, since it uses less digits than its factorization.

20515542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3419262.

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 20515542 is about 4529.4085706635. The cubic root of 20515542 is about 273.7543307419.

The spelling of 20515542 in words is "twenty million, five hundred fifteen thousand, five hundred forty-two".