20774628 has 54 divisors (see below), whose sum is σ = 61092486. Its totient is φ = 5935104.

The previous prime is 20774627. The next prime is 20774639. The reversal of 20774628 is 82647702.

20774628 is a `hidden beast` number, since 20 + 7 + 7 + 4 + 628 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19079424 + 1695204 = 4368^2 + 1302^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 20774592 and 20774601.

It is not an unprimeable number, because it can be changed into a prime (20774627) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4125 + ... + 7652.

Almost surely, 2^20774628 is an apocalyptic number.

20774628 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20774628 is an abundant number, since it is smaller than the sum of its proper divisors (40317858).

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

20774628 is a wasteful number, since it uses less digits than its factorization.

20774628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11801 (or 11789 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 36.

The square root of 20774628 is about 4557.9192621195. The cubic root of 20774628 is about 274.9019066117.

The spelling of 20774628 in words is "twenty million, seven hundred seventy-four thousand, six hundred twenty-eight".