20105213454 has 12 divisors (see below), whose sum is σ = 43561295856. Its totient is φ = 6701737812.

The previous prime is 20105213423. The next prime is 20105213473. The reversal of 20105213454 is 45431250102.

20105213454 is a `hidden beast` number, since 201 + 0 + 5 + 2 + 1 + 3 + 454 = 666.

It is a super-2 number, since 2×20105213454² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 558478134 + ... + 558478169.

It is an arithmetic number, because the mean of its divisors is an integer number (3630107988).

Almost surely, 2^20105213454 is an apocalyptic number.

20105213454 is an abundant number, since it is smaller than the sum of its proper divisors (23456082402).

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

20105213454 is a wasteful number, since it uses less digits than its factorization.

20105213454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1116956311 (or 1116956308 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 20105213454 its reverse (45431250102), we get a palindrome (65536463556).

The spelling of 20105213454 in words is "twenty billion, one hundred five million, two hundred thirteen thousand, four hundred fifty-four".