20520156641154 has 32 divisors (see below), whose sum is σ = 42046758198144. Its totient is φ = 6672354741120.

The previous prime is 20520156641107. The next prime is 20520156641161. The reversal of 20520156641154 is 45114665102502.

It is a happy number.

It is a super-2 number, since 2×20520156641154² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3519529 + ... + 7309404.

It is an arithmetic number, because the mean of its divisors is an integer number (1313961193692).

Almost surely, 2^{20520156641154} is an apocalyptic number.

20520156641154 is an abundant number, since it is smaller than the sum of its proper divisors (21526601556990).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20520156641154 is a wasteful number, since it uses less digits than its factorization.

20520156641154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10836682.

The product of its (nonzero) digits is 288000, while the sum is 42.

The spelling of 20520156641154 in words is "twenty trillion, five hundred twenty billion, one hundred fifty-six million, six hundred forty-one thousand, one hundred fifty-four".