18404920

素因数分解:

$2^3\times 5^1\times {\mathrm{19}}^1\times {\mathrm{61}}^1\times {\mathrm{397}}^1$

素因数の和:488

約数の個数: 64

約数和(自身を含む): 44416800

約数和(自身を除く): 26011880

約数列:

[1, 2, 4, 5, 8, 10, 19, 20, 38, 40, 61, 76, 95, 122, 152, 190, 244, 305, 380, 397, 488, 610, 760, 794, 1159, 1220, 1588, 1985, 2318, 2440, 3176, 3970, 4636, 5795, 7543, 7940, 9272, 11590, 15086, 15880, 23180, 24217, 30172, 37715, 46360, 48434, 60344, 75430, 96868, 121085, 150860, 193736, 242170, 301720, 460123, 484340, 920246, 968680, 1840492, 2300615, 3680984, 4601230, 9202460, 18404920]

約数ペア:

[(1, 18404920), (2, 9202460), (4, 4601230), (5, 3680984), (8, 2300615), (10, 1840492), (19, 968680), (20, 920246), (38, 484340), (40, 460123), (61, 301720), (76, 242170), (95, 193736), (122, 150860), (152, 121085), (190, 96868), (244, 75430), (305, 60344), (380, 48434), (397, 46360), (488, 37715), (610, 30172), (760, 24217), (794, 23180), (1159, 15880), (1220, 15086), (1588, 11590), (1985, 9272), (2318, 7940), (2440, 7543), (3176, 5795), (3970, 4636)]