20479470 has 64 divisors (see below), whose sum is σ = 54051840. Its totient is φ = 4924800.

The previous prime is 20479439. The next prime is 20479489. The reversal of 20479470 is 7497402.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 75435 + ... + 75705.

It is an arithmetic number, because the mean of its divisors is an integer number (844560).

Almost surely, 2^20479470 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20479470, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27025920).

20479470 is an abundant number, since it is smaller than the sum of its proper divisors (33572370).

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

20479470 is a wasteful number, since it uses less digits than its factorization.

20479470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521.

The product of its (nonzero) digits is 14112, while the sum is 33.

The square root of 20479470 is about 4525.4248419347. The cubic root of 20479470 is about 273.5937913249.

The spelling of 20479470 in words is "twenty million, four hundred seventy-nine thousand, four hundred seventy".