20674457505 has 24 divisors (see below), whose sum is σ = 38592321768. Its totient is φ = 10178194176.

The previous prime is 20674457471. The next prime is 20674457509. The reversal of 20674457505 is 50575447602.

20674457505 is a `hidden beast` number, since 2 + 0 + 6 + 74 + 4 + 575 + 0 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 48902049 + 20625555456 = 6993^2 + 143616^2 .

It is not a de Polignac number, because 20674457505 - 2²³ = 20666068897 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20674457509) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17669892 + ... + 17671061.

It is an arithmetic number, because the mean of its divisors is an integer number (1608013407).

Almost surely, 2^20674457505 is an apocalyptic number.

It is an amenable number.

20674457505 is a deficient number, since it is larger than the sum of its proper divisors (17917864263).

20674457505 is a wasteful number, since it uses less digits than its factorization.

20674457505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35340977 (or 35340974 counting only the distinct ones).

The product of its (nonzero) digits is 1176000, while the sum is 45.

The spelling of 20674457505 in words is "twenty billion, six hundred seventy-four million, four hundred fifty-seven thousand, five hundred five".