20000001690 has 24 divisors (see below), whose sum is σ = 52000004628. Its totient is φ = 5333333760.

The previous prime is 20000001689. The next prime is 20000001701. The reversal of 20000001690 is 9610000002.

It can be written as a sum of positive squares in 2 ways, for example, as 18238772601 + 1761229089 = 135051^2 + 41967^2 .

It is a super-2 number, since 2×20000001690² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 111111031 + ... + 111111210.

Almost surely, 2^20000001690 is an apocalyptic number.

20000001690 is an abundant number, since it is smaller than the sum of its proper divisors (32000002938).

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

20000001690 is a wasteful number, since it uses less digits than its factorization.

20000001690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222222254 (or 222222251 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 20000001690 its reverse (9610000002), we get a palindrome (29610001692).

The spelling of 20000001690 in words is "twenty billion, one thousand, six hundred ninety".