21871720

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{42061}}^1$

素因数の和:42085

約数の個数: 32

約数和(自身を含む): 52998120

約数和(自身を除く): 31126400

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 260, 520, 42061, 84122, 168244, 210305, 336488, 420610, 546793, 841220, 1093586, 1682440, 2187172, 2733965, 4374344, 5467930, 10935860, 21871720]

約数ペア:

[(1, 21871720), (2, 10935860), (4, 5467930), (5, 4374344), (8, 2733965), (10, 2187172), (13, 1682440), (20, 1093586), (26, 841220), (40, 546793), (52, 420610), (65, 336488), (104, 210305), (130, 168244), (260, 84122), (520, 42061)]