20883540 has 96 divisors (see below), whose sum is σ = 62818560. Its totient is φ = 5170176.

The previous prime is 20883539. The next prime is 20883617. The reversal of 20883540 is 4538802.

It is a super-2 number, since 2×20883540² = 872244485863200, which contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 20883498 and 20883507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50856 + ... + 51264.

It is an arithmetic number, because the mean of its divisors is an integer number (654360).

Almost surely, 2^20883540 is an apocalyptic number.

20883540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20883540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31409280).

20883540 is an abundant number, since it is smaller than the sum of its proper divisors (41935020).

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

20883540 is a wasteful number, since it uses less digits than its factorization.

20883540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481 (or 479 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 20883540 is about 4569.8512010787. The cubic root of 20883540 is about 275.3814650980.

The spelling of 20883540 in words is "twenty million, eight hundred eighty-three thousand, five hundred forty".