20847465 has 48 divisors (see below), whose sum is σ = 39124800. Its totient is φ = 10233216.

The previous prime is 20847451. The next prime is 20847481. The reversal of 20847465 is 56474802.

It is not a de Polignac number, because 20847465 - 2⁶ = 20847401 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 31306 + ... + 31964.

It is an arithmetic number, because the mean of its divisors is an integer number (815100).

Almost surely, 2^20847465 is an apocalyptic number.

It is an amenable number.

20847465 is a deficient number, since it is larger than the sum of its proper divisors (18277335).

20847465 is a wasteful number, since it uses less digits than its factorization.

20847465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726 (or 723 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The square root of 20847465 is about 4565.9024299693. The cubic root of 20847465 is about 275.2228056595. Note that the first 3 decimals are identical.

It can be divided in two parts, 20847 and 465, that added together give a palindrome (21312).

The spelling of 20847465 in words is "twenty million, eight hundred forty-seven thousand, four hundred sixty-five".