20155069 has 4 divisors (see below), whose sum is σ = 21987360. Its totient is φ = 18322780.

The previous prime is 20155039. The next prime is 20155073. The reversal of 20155069 is 96055102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20155069 - 2⁷ = 20154941 is a prime.

It is a super-2 number, since 2×20155069² = 812453612789522, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20155039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 916129 + ... + 916150.

It is an arithmetic number, because the mean of its divisors is an integer number (5496840).

Almost surely, 2^20155069 is an apocalyptic number.

It is an amenable number.

20155069 is a deficient number, since it is larger than the sum of its proper divisors (1832291).

20155069 is a wasteful number, since it uses less digits than its factorization.

20155069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1832290.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 20155069 is about 4489.4397200542. The cubic root of 20155069 is about 272.1414930283.

The spelling of 20155069 in words is "twenty million, one hundred fifty-five thousand, sixty-nine".