20156151081 has 24 divisors (see below), whose sum is σ = 30260657952. Its totient is φ = 11917892800.

The previous prime is 20156151047. The next prime is 20156151091. The reversal of 20156151081 is 18015165102.

It is not a de Polignac number, because 20156151081 - 2⁶ = 20156151017 is a prime.

It is a super-2 number, since 2×20156151081² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20156151091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 662271 + ... + 692036.

It is an arithmetic number, because the mean of its divisors is an integer number (1260860748).

Almost surely, 2^20156151081 is an apocalyptic number.

It is an amenable number.

20156151081 is a deficient number, since it is larger than the sum of its proper divisors (10104506871).

20156151081 is a wasteful number, since it uses less digits than its factorization.

20156151081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1354373 (or 1354362 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 30.

The spelling of 20156151081 in words is "twenty billion, one hundred fifty-six million, one hundred fifty-one thousand, eighty-one".