20826620

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{61}}^1\times {\mathrm{397}}^1$

素因数の和:510

約数の個数: 48

約数和(自身を含む): 45601248

約数和(自身を除く): 24774628

約数列:

[1, 2, 4, 5, 10, 20, 43, 61, 86, 122, 172, 215, 244, 305, 397, 430, 610, 794, 860, 1220, 1588, 1985, 2623, 3970, 5246, 7940, 10492, 13115, 17071, 24217, 26230, 34142, 48434, 52460, 68284, 85355, 96868, 121085, 170710, 242170, 341420, 484340, 1041331, 2082662, 4165324, 5206655, 10413310, 20826620]

約数ペア:

[(1, 20826620), (2, 10413310), (4, 5206655), (5, 4165324), (10, 2082662), (20, 1041331), (43, 484340), (61, 341420), (86, 242170), (122, 170710), (172, 121085), (215, 96868), (244, 85355), (305, 68284), (397, 52460), (430, 48434), (610, 34142), (794, 26230), (860, 24217), (1220, 17071), (1588, 13115), (1985, 10492), (2623, 7940), (3970, 5246)]