20214540 has 36 divisors (see below), whose sum is σ = 61317984. Its totient is φ = 5390496.

The previous prime is 20214529. The next prime is 20214541. The reversal of 20214540 is 4541202.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20214541) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 55972 + ... + 56331.

Almost surely, 2^20214540 is an apocalyptic number.

20214540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20214540 is an abundant number, since it is smaller than the sum of its proper divisors (41103444).

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

20214540 is a wasteful number, since it uses less digits than its factorization.

20214540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112318 (or 112313 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 20214540 is about 4496.0582736437. The cubic root of 20214540 is about 272.4088969647.

Adding to 20214540 its reverse (4541202), we get a palindrome (24755742).

It can be divided in two parts, 2021 and 4540, that added together give a 8-th power (6561 = 3⁸).

The spelling of 20214540 in words is "twenty million, two hundred fourteen thousand, five hundred forty".