21173990

素因数分解:

$2^1\times 5^1\times {\mathrm{37}}^1\times {\mathrm{89}}^1\times {\mathrm{643}}^1$

素因数の和:776

約数の個数: 32

約数和(自身を含む): 39644640

約数和(自身を除く): 18470650

約数列:

[1, 2, 5, 10, 37, 74, 89, 178, 185, 370, 445, 643, 890, 1286, 3215, 3293, 6430, 6586, 16465, 23791, 32930, 47582, 57227, 114454, 118955, 237910, 286135, 572270, 2117399, 4234798, 10586995, 21173990]

約数ペア:

[(1, 21173990), (2, 10586995), (5, 4234798), (10, 2117399), (37, 572270), (74, 286135), (89, 237910), (178, 118955), (185, 114454), (370, 57227), (445, 47582), (643, 32930), (890, 23791), (1286, 16465), (3215, 6586), (3293, 6430)]