20501544155 has 8 divisors (see below), whose sum is σ = 25671498912. Its totient is φ = 15688138048.

The previous prime is 20501544127. The next prime is 20501544157. The reversal of 20501544155 is 55144510502.

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

It is a cyclic number.

It is not a de Polignac number, because 20501544155 - 2¹⁶ = 20501478619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20501544157) 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, 89137034 + ... + 89137263.

It is an arithmetic number, because the mean of its divisors is an integer number (3208937364).

Almost surely, 2^20501544155 is an apocalyptic number.

20501544155 is a deficient number, since it is larger than the sum of its proper divisors (5169954757).

20501544155 is a wasteful number, since it uses less digits than its factorization.

20501544155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178274325.

The product of its (nonzero) digits is 20000, while the sum is 32.

The spelling of 20501544155 in words is "twenty billion, five hundred one million, five hundred forty-four thousand, one hundred fifty-five".