20554435642 has 8 divisors (see below), whose sum is σ = 33203319156. Its totient is φ = 9486662592.

The previous prime is 20554435549. The next prime is 20554435661. The reversal of 20554435642 is 24653445502.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20537469481 + 16966161 = 143309^2 + 4119^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×20554435642² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20554435595 and 20554435604.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 395277583 + ... + 395277634.

Almost surely, 2^20554435642 is an apocalyptic number.

20554435642 is a deficient number, since it is larger than the sum of its proper divisors (12648883514).

20554435642 is a wasteful number, since it uses less digits than its factorization.

20554435642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790555232.

The product of its (nonzero) digits is 576000, while the sum is 40.

The spelling of 20554435642 in words is "twenty billion, five hundred fifty-four million, four hundred thirty-five thousand, six hundred forty-two".