20705478 has 32 divisors (see below), whose sum is σ = 45100800. Its totient is φ = 6312096.

The previous prime is 20705471. The next prime is 20705491. The reversal of 20705478 is 87450702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20705471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 175 + ... + 6437.

It is an arithmetic number, because the mean of its divisors is an integer number (1409400).

Almost surely, 2^20705478 is an apocalyptic number.

20705478 is an abundant number, since it is smaller than the sum of its proper divisors (24395322).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20705478 is a wasteful number, since it uses less digits than its factorization.

20705478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6316.

The product of its (nonzero) digits is 15680, while the sum is 33.

The square root of 20705478 is about 4550.3272409795. The cubic root of 20705478 is about 274.5965566204.

The spelling of 20705478 in words is "twenty million, seven hundred five thousand, four hundred seventy-eight".