20013655 has 8 divisors (see below), whose sum is σ = 24254784. Its totient is φ = 15852000.

The previous prime is 20013613. The next prime is 20013659. The reversal of 20013655 is 55631002.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20013655 - 2¹⁵ = 19980887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20013659) 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, 19311 + ... + 20320.

It is an arithmetic number, because the mean of its divisors is an integer number (3031848).

Almost surely, 2^20013655 is an apocalyptic number.

20013655 is a deficient number, since it is larger than the sum of its proper divisors (4241129).

20013655 is a wasteful number, since it uses less digits than its factorization.

20013655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39737.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 20013655 is about 4473.6623699157. The cubic root of 20013655 is about 271.5035232266.

Adding to 20013655 its reverse (55631002), we get a palindrome (75644657).

The spelling of 20013655 in words is "twenty million, thirteen thousand, six hundred fifty-five".