20001009977 has 8 divisors (see below), whose sum is σ = 21548008776. Its totient is φ = 18455219712.

The previous prime is 20001009953. The next prime is 20001010021. The reversal of 20001009977 is 77990010002.

It can be written as a sum of positive squares in 4 ways, for example, as 2524921 + 19998485056 = 1589^2 + 141416^2 .

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 20001009977 - 2¹² = 20001005881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20001009937) 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, 267608 + ... + 334089.

It is an arithmetic number, because the mean of its divisors is an integer number (2693501097).

Almost surely, 2^20001009977 is an apocalyptic number.

It is an amenable number.

20001009977 is a deficient number, since it is larger than the sum of its proper divisors (1546998799).

20001009977 is a wasteful number, since it uses less digits than its factorization.

20001009977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604267.

The product of its (nonzero) digits is 7938, while the sum is 35.

Adding to 20001009977 its reverse (77990010002), we get a palindrome (97991019979).

The spelling of 20001009977 in words is "twenty billion, one million, nine thousand, nine hundred seventy-seven".