20541720 has 64 divisors (see below), whose sum is σ = 62519040. Its totient is φ = 5398400.

The previous prime is 20541707. The next prime is 20541733. The reversal of 20541720 is 2714502.

It is an interprime number because it is at equal distance from previous prime (20541707) and next prime (20541733).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7315 + ... + 9725.

It is an arithmetic number, because the mean of its divisors is an integer number (976860).

Almost surely, 2^20541720 is an apocalyptic number.

20541720 is a gapful number since it is divisible by the number (20) 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 20541720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31259520).

20541720 is an abundant number, since it is smaller than the sum of its proper divisors (41977320).

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

20541720 is a wasteful number, since it uses less digits than its factorization.

20541720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2496 (or 2492 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 20541720 is about 4532.2974306636. The cubic root of 20541720 is about 273.8707188430.

The spelling of 20541720 in words is "twenty million, five hundred forty-one thousand, seven hundred twenty".