20635221404 has 12 divisors (see below), whose sum is σ = 41270442864. Its totient is φ = 8843666304.

The previous prime is 20635221371. The next prime is 20635221421. The reversal of 20635221404 is 40412253602.

20635221404 is an admirable number.

It is a congruent number.

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, 368486069 + ... + 368486124.

It is an arithmetic number, because the mean of its divisors is an integer number (3439203572).

Almost surely, 2^20635221404 is an apocalyptic number.

It is an amenable number.

20635221404 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20635221404 is a wasteful number, since it uses less digits than its factorization.

20635221404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 736972204 (or 736972202 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

The spelling of 20635221404 in words is "twenty billion, six hundred thirty-five million, two hundred twenty-one thousand, four hundred four".