20933490155 has 8 divisors (see below), whose sum is σ = 25224422784. Its totient is φ = 16677302400.

The previous prime is 20933490139. The next prime is 20933490157. The reversal of 20933490155 is 55109433902.

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

It is not a de Polignac number, because 20933490155 - 2⁴ = 20933490139 is a prime.

It is a super-2 number, since 2×20933490155² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20933490157) 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, 8684891 + ... + 8687300.

It is an arithmetic number, because the mean of its divisors is an integer number (3153052848).

Almost surely, 2^20933490155 is an apocalyptic number.

20933490155 is a deficient number, since it is larger than the sum of its proper divisors (4290932629).

20933490155 is a wasteful number, since it uses less digits than its factorization.

20933490155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17372437.

The product of its (nonzero) digits is 145800, while the sum is 41.

The spelling of 20933490155 in words is "twenty billion, nine hundred thirty-three million, four hundred ninety thousand, one hundred fifty-five".