20431548 has 48 divisors (see below), whose sum is σ = 54412960. Its totient is φ = 6625152.

The previous prime is 20431547. The next prime is 20431549. The reversal of 20431548 is 84513402.

It is an interprime number because it is at equal distance from previous prime (20431547) and next prime (20431549).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20431547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1440 + ... + 6552.

Almost surely, 2^20431548 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20431548, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27206480).

20431548 is an abundant number, since it is smaller than the sum of its proper divisors (33981412).

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

20431548 is a wasteful number, since it uses less digits than its factorization.

20431548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5163 (or 5155 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 20431548 is about 4520.1269893666. The cubic root of 20431548 is about 273.3802213171.

The spelling of 20431548 in words is "twenty million, four hundred thirty-one thousand, five hundred forty-eight".