20691416239454 has 16 divisors (see below), whose sum is σ = 31060718179008. Its totient is φ = 10337844350592.

The previous prime is 20691416239433. The next prime is 20691416239471. The reversal of 20691416239454 is 45493261419602.

It is a happy number.

It is a super-2 number, since 2×20691416239454² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20691416239454.

It is a congruent number.

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, 51646034 + ... + 52045130.

It is an arithmetic number, because the mean of its divisors is an integer number (1941294886188).

Almost surely, 2^{20691416239454} is an apocalyptic number.

20691416239454 is a deficient number, since it is larger than the sum of its proper divisors (10369301939554).

20691416239454 is a wasteful number, since it uses less digits than its factorization.

20691416239454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418739.

The product of its (nonzero) digits is 11197440, while the sum is 56.

The spelling of 20691416239454 in words is "twenty trillion, six hundred ninety-one billion, four hundred sixteen million, two hundred thirty-nine thousand, four hundred fifty-four".