20487420 has 36 divisors (see below), whose sum is σ = 62145720. Its totient is φ = 5463264.

The previous prime is 20487407. The next prime is 20487433. The reversal of 20487420 is 2478402.

It is an interprime number because it is at equal distance from previous prime (20487407) and next prime (20487433).

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-3 number, since 3×20487420³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56730 + ... + 57089.

It is an arithmetic number, because the mean of its divisors is an integer number (1726270).

Almost surely, 2^20487420 is an apocalyptic number.

20487420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20487420 is an abundant number, since it is smaller than the sum of its proper divisors (41658300).

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

20487420 is a wasteful number, since it uses less digits than its factorization.

20487420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113834 (or 113829 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 20487420 is about 4526.3031272773. The cubic root of 20487420 is about 273.6291892014.

The spelling of 20487420 in words is "twenty million, four hundred eighty-seven thousand, four hundred twenty".