20901504 has 128 divisors (see below), whose sum is σ = 61689600. Its totient is φ = 6230016.

The previous prime is 20901499. The next prime is 20901509. The reversal of 20901504 is 40510902.

It is an interprime number because it is at equal distance from previous prime (20901499) and next prime (20901509).

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20901509) 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, 264537 + ... + 264615.

It is an arithmetic number, because the mean of its divisors is an integer number (481950).

Almost surely, 2^20901504 is an apocalyptic number.

20901504 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 20901504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30844800).

20901504 is an abundant number, since it is smaller than the sum of its proper divisors (40788096).

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

20901504 is a wasteful number, since it uses less digits than its factorization.

20901504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162 (or 150 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 20901504 is about 4571.8162692742. The cubic root of 20901504 is about 275.4604034207.

The spelling of 20901504 in words is "twenty million, nine hundred one thousand, five hundred four".