20507274465 has 32 divisors (see below), whose sum is σ = 34844273280. Its totient is φ = 10269858816.

The previous prime is 20507274461. The next prime is 20507274553. The reversal of 20507274465 is 56447270502.

It is not a de Polignac number, because 20507274465 - 2² = 20507274461 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20507274461) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 286182 + ... + 350591.

It is an arithmetic number, because the mean of its divisors is an integer number (1088883540).

Almost surely, 2^20507274465 is an apocalyptic number.

It is an amenable number.

20507274465 is a deficient number, since it is larger than the sum of its proper divisors (14336998815).

20507274465 is a wasteful number, since it uses less digits than its factorization.

20507274465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636913.

The product of its (nonzero) digits is 470400, while the sum is 42.

The spelling of 20507274465 in words is "twenty billion, five hundred seven million, two hundred seventy-four thousand, four hundred sixty-five".