21365240

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{181}}^1\times {\mathrm{227}}^1$

素因数の和:432

約数の個数: 64

約数和(自身を含む): 52284960

約数和(自身を除く): 30919720

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 181, 227, 260, 362, 454, 520, 724, 905, 908, 1135, 1448, 1810, 1816, 2270, 2353, 2951, 3620, 4540, 4706, 5902, 7240, 9080, 9412, 11765, 11804, 14755, 18824, 23530, 23608, 29510, 41087, 47060, 59020, 82174, 94120, 118040, 164348, 205435, 328696, 410870, 534131, 821740, 1068262, 1643480, 2136524, 2670655, 4273048, 5341310, 10682620, 21365240]

約数ペア:

[(1, 21365240), (2, 10682620), (4, 5341310), (5, 4273048), (8, 2670655), (10, 2136524), (13, 1643480), (20, 1068262), (26, 821740), (40, 534131), (52, 410870), (65, 328696), (104, 205435), (130, 164348), (181, 118040), (227, 94120), (260, 82174), (362, 59020), (454, 47060), (520, 41087), (724, 29510), (905, 23608), (908, 23530), (1135, 18824), (1448, 14755), (1810, 11804), (1816, 11765), (2270, 9412), (2353, 9080), (2951, 7240), (3620, 5902), (4540, 4706)]