20074428 has 72 divisors (see below), whose sum is σ = 55875456. Its totient is φ = 6026400.

The previous prime is 20074427. The next prime is 20074447. The reversal of 20074428 is 82447002.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20074427) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64393 + ... + 64703.

It is an arithmetic number, because the mean of its divisors is an integer number (776048).

Almost surely, 2^20074428 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20074428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27937728).

20074428 is an abundant number, since it is smaller than the sum of its proper divisors (35801028).

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

20074428 is a wasteful number, since it uses less digits than its factorization.

20074428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495 (or 490 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 20074428 is about 4480.4495310181. The cubic root of 20074428 is about 271.7780592951.

It can be divided in two parts, 20074 and 428, that added together give a palindrome (20502).

The spelling of 20074428 in words is "twenty million, seventy-four thousand, four hundred twenty-eight".