20542464 has 88 divisors (see below), whose sum is σ = 60918720. Its totient is φ = 6838272.

The previous prime is 20542463. The next prime is 20542471. The reversal of 20542464 is 46424502.

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 (20542463) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27277 + ... + 28019.

Almost surely, 2^20542464 is an apocalyptic number.

20542464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20542464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30459360).

20542464 is an abundant number, since it is smaller than the sum of its proper divisors (40376256).

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

20542464 is an equidigital number, since it uses as much as digits as its factorization.

20542464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772 (or 748 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

The square root of 20542464 is about 4532.3795074993. The cubic root of 20542464 is about 273.8740252418.

Adding to 20542464 its reverse (46424502), we get a palindrome (66966966).

The spelling of 20542464 in words is "twenty million, five hundred forty-two thousand, four hundred sixty-four".