20426551405 has 8 divisors (see below), whose sum is σ = 26397389592. Its totient is φ = 15084222528.

The previous prime is 20426551351. The next prime is 20426551463. The reversal of 20426551405 is 50415562402.

It can be written as a sum of positive squares in 4 ways, for example, as 86657481 + 20339893924 = 9309^2 + 142618^2 .

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 20426551405 - 2¹⁹ = 20426027117 is a prime.

It is a super-2 number, since 2×20426551405² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157127254 + ... + 157127383.

It is an arithmetic number, because the mean of its divisors is an integer number (3299673699).

Almost surely, 2^20426551405 is an apocalyptic number.

It is an amenable number.

20426551405 is a deficient number, since it is larger than the sum of its proper divisors (5970838187).

20426551405 is a wasteful number, since it uses less digits than its factorization.

20426551405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314254655.

The product of its (nonzero) digits is 48000, while the sum is 34.

The spelling of 20426551405 in words is "twenty billion, four hundred twenty-six million, five hundred fifty-one thousand, four hundred five".