20469745 has 8 divisors (see below), whose sum is σ = 25856640. Its totient is φ = 15513840.

The previous prime is 20469739. The next prime is 20469791. The reversal of 20469745 is 54796402.

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

It is not a de Polignac number, because 20469745 - 2⁹ = 20469233 is a prime.

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, 107641 + ... + 107830.

It is an arithmetic number, because the mean of its divisors is an integer number (3232080).

Almost surely, 2^20469745 is an apocalyptic number.

It is an amenable number.

20469745 is a deficient number, since it is larger than the sum of its proper divisors (5386895).

20469745 is a wasteful number, since it uses less digits than its factorization.

20469745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215495.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 20469745 is about 4524.3502295910. The cubic root of 20469745 is about 273.5504776895.

The spelling of 20469745 in words is "twenty million, four hundred sixty-nine thousand, seven hundred forty-five".