20426428 has 12 divisors (see below), whose sum is σ = 38995992. Its totient is φ = 9284720.

The previous prime is 20426423. The next prime is 20426429. The reversal of 20426428 is 82462402.

It is a junction number, because it is equal to n+sod(n) for n = 20426396 and 20426405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20426423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 232075 + ... + 232162.

It is an arithmetic number, because the mean of its divisors is an integer number (3249666).

Almost surely, 2^20426428 is an apocalyptic number.

It is an amenable number.

20426428 is a deficient number, since it is larger than the sum of its proper divisors (18569564).

20426428 is a wasteful number, since it uses less digits than its factorization.

20426428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464252 (or 464250 counting only the distinct ones).

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

The square root of 20426428 is about 4519.5605981113. The cubic root of 20426428 is about 273.3573836991.

The spelling of 20426428 in words is "twenty million, four hundred twenty-six thousand, four hundred twenty-eight".