20408164399 has 12 divisors (see below), whose sum is σ = 23746568904. Its totient is φ = 17487952944.

The previous prime is 20408164393. The next prime is 20408164429. The reversal of 20408164399 is 99346180402.

It is not a de Polignac number, because 20408164399 - 2¹³ = 20408156207 is a prime.

It is a super-2 number, since 2×20408164399² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20408164393) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 131589 + ... + 241105.

It is an arithmetic number, because the mean of its divisors is an integer number (1978880742).

Almost surely, 2^20408164399 is an apocalyptic number.

20408164399 is a deficient number, since it is larger than the sum of its proper divisors (3338404505).

20408164399 is a wasteful number, since it uses less digits than its factorization.

20408164399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113334 (or 113327 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 46.

The spelling of 20408164399 in words is "twenty billion, four hundred eight million, one hundred sixty-four thousand, three hundred ninety-nine".