20967540 has 48 divisors (see below), whose sum is σ = 64048320. Its totient is φ = 5082880.

The previous prime is 20967539. The next prime is 20967547. The reversal of 20967540 is 4576902.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20967547) 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, 15225 + ... + 16544.

It is an arithmetic number, because the mean of its divisors is an integer number (1334340).

Almost surely, 2^20967540 is an apocalyptic number.

20967540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20967540 is an abundant number, since it is smaller than the sum of its proper divisors (43080780).

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

20967540 is a wasteful number, since it uses less digits than its factorization.

20967540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31792 (or 31790 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 20967540 is about 4579.0326489336. The cubic root of 20967540 is about 275.7501940502.

The spelling of 20967540 in words is "twenty million, nine hundred sixty-seven thousand, five hundred forty".