20720465 has 8 divisors (see below), whose sum is σ = 24894528. Its totient is φ = 16556400.

The previous prime is 20720459. The next prime is 20720519. The reversal of 20720465 is 56402702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20720465 - 2⁴ = 20720449 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3284 + ... + 7226.

It is an arithmetic number, because the mean of its divisors is an integer number (3111816).

Almost surely, 2^20720465 is an apocalyptic number.

It is an amenable number.

20720465 is a deficient number, since it is larger than the sum of its proper divisors (4174063).

20720465 is a wasteful number, since it uses less digits than its factorization.

20720465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4999.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 20720465 is about 4551.9737477275. The cubic root of 20720465 is about 274.6627932956.

The spelling of 20720465 in words is "twenty million, seven hundred twenty thousand, four hundred sixty-five".