20640023154 has 16 divisors (see below), whose sum is σ = 45866718240. Its totient is φ = 6880007700.

The previous prime is 20640023099. The next prime is 20640023161. The reversal of 20640023154 is 45132004602.

20640023154 is a `hidden beast` number, since 2 + 0 + 640 + 0 + 2 + 3 + 15 + 4 = 666.

It is a super-2 number, since 2×20640023154² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191111272 + ... + 191111379.

It is an arithmetic number, because the mean of its divisors is an integer number (2866669890).

Almost surely, 2^20640023154 is an apocalyptic number.

20640023154 is an abundant number, since it is smaller than the sum of its proper divisors (25226695086).

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

20640023154 is a wasteful number, since it uses less digits than its factorization.

20640023154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382222662 (or 382222656 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 20640023154 its reverse (45132004602), we get a palindrome (65772027756).

The spelling of 20640023154 in words is "twenty billion, six hundred forty million, twenty-three thousand, one hundred fifty-four".