19991660

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{4523}}^1$

素因数の和:4562

約数の個数: 48

約数和(自身を含む): 47882016

約数和(自身を除く): 27890356

約数列:

[1, 2, 4, 5, 10, 13, 17, 20, 26, 34, 52, 65, 68, 85, 130, 170, 221, 260, 340, 442, 884, 1105, 2210, 4420, 4523, 9046, 18092, 22615, 45230, 58799, 76891, 90460, 117598, 153782, 235196, 293995, 307564, 384455, 587990, 768910, 999583, 1175980, 1537820, 1999166, 3998332, 4997915, 9995830, 19991660]

約数ペア:

[(1, 19991660), (2, 9995830), (4, 4997915), (5, 3998332), (10, 1999166), (13, 1537820), (17, 1175980), (20, 999583), (26, 768910), (34, 587990), (52, 384455), (65, 307564), (68, 293995), (85, 235196), (130, 153782), (170, 117598), (221, 90460), (260, 76891), (340, 58799), (442, 45230), (884, 22615), (1105, 18092), (2210, 9046), (4420, 4523)]