20007428 has 12 divisors (see below), whose sum is σ = 40014912. Its totient is φ = 8574600.

The previous prime is 20007409. The next prime is 20007457. The reversal of 20007428 is 82470002.

20007428 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 357248 + ... + 357303.

It is an arithmetic number, because the mean of its divisors is an integer number (3334576).

Almost surely, 2^20007428 is an apocalyptic number.

20007428 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20007428 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20007428 is a wasteful number, since it uses less digits than its factorization.

20007428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714562 (or 714560 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 20007428 is about 4472.9663535511. The cubic root of 20007428 is about 271.4753619902.

The spelling of 20007428 in words is "twenty million, seven thousand, four hundred twenty-eight".