20428426 has 12 divisors (see below), whose sum is σ = 31292082. Its totient is φ = 9998664.

The previous prime is 20428423. The next prime is 20428433. The reversal of 20428426 is 62482402.

It can be written as a sum of positive squares in only one way, i.e., 15610401 + 4818025 = 3951^2 + 2195^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20428394 and 20428403.

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 5 ways as a sum of consecutive naturals, for example, 46315 + ... + 46753.

Almost surely, 2^20428426 is an apocalyptic number.

20428426 is a deficient number, since it is larger than the sum of its proper divisors (10863656).

20428426 is an frugal number, since it uses more digits than its factorization.

20428426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 933 (or 494 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 28.

The square root of 20428426 is about 4519.7816318933. The cubic root of 20428426 is about 273.3662961767.

The spelling of 20428426 in words is "twenty million, four hundred twenty-eight thousand, four hundred twenty-six".