20247520 has 24 divisors (see below), whose sum is σ = 47835144. Its totient is φ = 8098944.

The previous prime is 20247509. The next prime is 20247523. The reversal of 20247520 is 2574202.

It is a junction number, because it is equal to n+sod(n) for n = 20247491 and 20247500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20247523) 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 3 ways as a sum of consecutive naturals, for example, 63114 + ... + 63433.

It is an arithmetic number, because the mean of its divisors is an integer number (1993131).

Almost surely, 2^20247520 is an apocalyptic number.

20247520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20247520 is an abundant number, since it is smaller than the sum of its proper divisors (27587624).

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

20247520 is a wasteful number, since it uses less digits than its factorization.

20247520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126562 (or 126554 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 22.

The square root of 20247520 is about 4499.7244360072. The cubic root of 20247520 is about 272.5569614111.

The spelling of 20247520 in words is "twenty million, two hundred forty-seven thousand, five hundred twenty".