20420040266 has 8 divisors (see below), whose sum is σ = 30658087524. Its totient is φ = 10200677760.

The previous prime is 20420040247. The next prime is 20420040269. The reversal of 20420040266 is 66204002402.

It can be written as a sum of positive squares in 2 ways, for example, as 14618019025 + 5802021241 = 120905^2 + 76171^2 .

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

It is a super-2 number, since 2×20420040266² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20420040269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4668455 + ... + 4672826.

Almost surely, 2^20420040266 is an apocalyptic number.

20420040266 is a deficient number, since it is larger than the sum of its proper divisors (10238047258).

20420040266 is a wasteful number, since it uses less digits than its factorization.

20420040266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9342376.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 20420040266 its reverse (66204002402), we get a palindrome (86624042668).

The spelling of 20420040266 in words is "twenty billion, four hundred twenty million, forty thousand, two hundred sixty-six".