20532440 has 16 divisors (see below), whose sum is σ = 46198080. Its totient is φ = 8212960.

The previous prime is 20532437. The next prime is 20532461. The reversal of 20532440 is 4423502.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 256616 + ... + 256695.

It is an arithmetic number, because the mean of its divisors is an integer number (2887380).

Almost surely, 2^20532440 is an apocalyptic number.

20532440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20532440 is an abundant number, since it is smaller than the sum of its proper divisors (25665640).

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

20532440 is a wasteful number, since it uses less digits than its factorization.

20532440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513322 (or 513318 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 20532440 is about 4531.2735516629. The cubic root of 20532440 is about 273.8294710298.

Adding to 20532440 its reverse (4423502), we get a palindrome (24955942).

The spelling of 20532440 in words is "twenty million, five hundred thirty-two thousand, four hundred forty".