20487740 has 48 divisors (see below), whose sum is σ = 52957632. Its totient is φ = 6483456.

The previous prime is 20487739. The next prime is 20487743. The reversal of 20487740 is 4778402.

It is a junction number, because it is equal to n+sod(n) for n = 20487697 and 20487706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20487743) 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 15 ways as a sum of consecutive naturals, for example, 3809 + ... + 7448.

It is an arithmetic number, because the mean of its divisors is an integer number (1103284).

Almost surely, 2^20487740 is an apocalyptic number.

20487740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20487740 is an abundant number, since it is smaller than the sum of its proper divisors (32469892).

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

20487740 is a wasteful number, since it uses less digits than its factorization.

20487740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11286 (or 11284 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 32.

The square root of 20487740 is about 4526.3384760753. The cubic root of 20487740 is about 273.6306138299.

The spelling of 20487740 in words is "twenty million, four hundred eighty-seven thousand, seven hundred forty".