20428473 has 32 divisors (see below), whose sum is σ = 30886912. Its totient is φ = 11923200.

The previous prime is 20428469. The next prime is 20428487. The reversal of 20428473 is 37482402.

It is not a de Polignac number, because 20428473 - 2² = 20428469 is a prime.

It is a super-2 number, since 2×20428473² = 834645018223458, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20428473.

It is not an unprimeable number, because it can be changed into a prime (20428423) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 73611 + ... + 73887.

It is an arithmetic number, because the mean of its divisors is an integer number (965216).

Almost surely, 2^20428473 is an apocalyptic number.

It is an amenable number.

20428473 is a deficient number, since it is larger than the sum of its proper divisors (10458439).

20428473 is a wasteful number, since it uses less digits than its factorization.

20428473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385.

The product of its (nonzero) digits is 10752, while the sum is 30.

The square root of 20428473 is about 4519.7868312565. The cubic root of 20428473 is about 273.3665058226.

The spelling of 20428473 in words is "twenty million, four hundred twenty-eight thousand, four hundred seventy-three".