20706520 has 32 divisors (see below), whose sum is σ = 46720800. Its totient is φ = 8259328.

The previous prime is 20706503. The next prime is 20706557. The reversal of 20706520 is 2560702.

It is a junction number, because it is equal to n+sod(n) for n = 20706491 and 20706500.

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, 24261 + ... + 25099.

It is an arithmetic number, because the mean of its divisors is an integer number (1460025).

Almost surely, 2^20706520 is an apocalyptic number.

20706520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20706520 is an abundant number, since it is smaller than the sum of its proper divisors (26014280).

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

20706520 is a wasteful number, since it uses less digits than its factorization.

20706520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1467 (or 1463 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 20706520 is about 4550.4417367987. The cubic root of 20706520 is about 274.6011628863.

It can be divided in two parts, 20706 and 520, that multiplied together give a triangular number (10767120 = T₄₆₄₀).

The spelling of 20706520 in words is "twenty million, seven hundred six thousand, five hundred twenty".