20345655 has 16 divisors (see below), whose sum is σ = 35512704. Its totient is φ = 9864480.

The previous prime is 20345629. The next prime is 20345659. The reversal of 20345655 is 55654302.

It is not a de Polignac number, because 20345655 - 2¹¹ = 20343607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20345659) 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, 61489 + ... + 61818.

It is an arithmetic number, because the mean of its divisors is an integer number (2219544).

Almost surely, 2^20345655 is an apocalyptic number.

20345655 is a deficient number, since it is larger than the sum of its proper divisors (15167049).

20345655 is a wasteful number, since it uses less digits than its factorization.

20345655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123326.

The product of its (nonzero) digits is 18000, while the sum is 30.

The square root of 20345655 is about 4510.6158116160. The cubic root of 20345655 is about 272.9965918881.

Adding to 20345655 its reverse (55654302), we get a palindrome (75999957).

The spelling of 20345655 in words is "twenty million, three hundred forty-five thousand, six hundred fifty-five".