20477284605 has 24 divisors (see below), whose sum is σ = 35522936280. Its totient is φ = 10912302720.

The previous prime is 20477284591. The next prime is 20477284613. The reversal of 20477284605 is 50648277402.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 13733261721 + 6744022884 = 117189^2 + 82122^2 .

It is not a de Polignac number, because 20477284605 - 2⁵ = 20477284573 is a prime.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 129826 + ... + 240435.

It is an arithmetic number, because the mean of its divisors is an integer number (1480122345).

Almost surely, 2^20477284605 is an apocalyptic number.

It is an amenable number.

20477284605 is a deficient number, since it is larger than the sum of its proper divisors (15045651675).

20477284605 is a wasteful number, since it uses less digits than its factorization.

20477284605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371501 (or 371498 counting only the distinct ones).

The product of its (nonzero) digits is 752640, while the sum is 45.

The spelling of 20477284605 in words is "twenty billion, four hundred seventy-seven million, two hundred eighty-four thousand, six hundred five".