20013546 has 16 divisors (see below), whose sum is σ = 45745344. Its totient is φ = 5718144.

The previous prime is 20013529. The next prime is 20013547. The reversal of 20013546 is 64531002.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (20013547) 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, 238215 + ... + 238298.

It is an arithmetic number, because the mean of its divisors is an integer number (2859084).

Almost surely, 2^20013546 is an apocalyptic number.

20013546 is an abundant number, since it is smaller than the sum of its proper divisors (25731798).

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

20013546 is a wasteful number, since it uses less digits than its factorization.

20013546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476525.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 20013546 is about 4473.6501874867. The cubic root of 20013546 is about 271.5030303309.

Adding to 20013546 its reverse (64531002), we get a palindrome (84544548).

The spelling of 20013546 in words is "twenty million, thirteen thousand, five hundred forty-six".