20638562101 has 8 divisors (see below), whose sum is σ = 21705467904. Its totient is φ = 19585787760.

The previous prime is 20638562093. The next prime is 20638562107. The reversal of 20638562101 is 10126583602.

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

It is a cyclic number.

It is not a de Polignac number, because 20638562101 - 2³ = 20638562093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20638562107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3529870 + ... + 3535711.

It is an arithmetic number, because the mean of its divisors is an integer number (2713183488).

Almost surely, 2^20638562101 is an apocalyptic number.

It is an amenable number.

20638562101 is a deficient number, since it is larger than the sum of its proper divisors (1066905803).

20638562101 is a wasteful number, since it uses less digits than its factorization.

20638562101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7065731.

The product of its (nonzero) digits is 17280, while the sum is 34.

The spelling of 20638562101 in words is "twenty billion, six hundred thirty-eight million, five hundred sixty-two thousand, one hundred one".