20051020 has 24 divisors (see below), whose sum is σ = 45935568. Its totient is φ = 7291200.

The previous prime is 20050981. The next prime is 20051047. The reversal of 20051020 is 2015002.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 20050988 and 20051006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45351 + ... + 45790.

It is an arithmetic number, because the mean of its divisors is an integer number (1913982).

Almost surely, 2^20051020 is an apocalyptic number.

20051020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20051020 is an abundant number, since it is smaller than the sum of its proper divisors (25884548).

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

20051020 is a wasteful number, since it uses less digits than its factorization.

20051020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91161 (or 91159 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 10.

The square root of 20051020 is about 4477.8365311833. The cubic root of 20051020 is about 271.6723816447.

Adding to 20051020 its reverse (2015002), we get a palindrome (22066022).

It can be divided in two parts, 2005 and 1020, that added together give a square (3025 = 55²).

The spelling of 20051020 in words is "twenty million, fifty-one thousand, twenty".