20774820 has 48 divisors (see below), whose sum is σ = 63459648. Its totient is φ = 5036160.

The previous prime is 20774807. The next prime is 20774821. The reversal of 20774820 is 2847702.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (20774821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15079 + ... + 16398.

It is an arithmetic number, because the mean of its divisors is an integer number (1322076).

Almost surely, 2^20774820 is an apocalyptic number.

20774820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20774820 is an abundant number, since it is smaller than the sum of its proper divisors (42684828).

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

20774820 is a wasteful number, since it uses less digits than its factorization.

20774820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31500 (or 31498 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 30.

The square root of 20774820 is about 4557.9403243132. The cubic root of 20774820 is about 274.9027534942.

The spelling of 20774820 in words is "twenty million, seven hundred seventy-four thousand, eight hundred twenty".