21986840

素因数分解:

$2^3\times 5^1\times {\mathrm{61}}^1\times {\mathrm{9011}}^1$

素因数の和:9083

約数の個数: 32

約数和(自身を含む): 50286960

約数和(自身を除く): 28300120

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 61, 122, 244, 305, 488, 610, 1220, 2440, 9011, 18022, 36044, 45055, 72088, 90110, 180220, 360440, 549671, 1099342, 2198684, 2748355, 4397368, 5496710, 10993420, 21986840]

約数ペア:

[(1, 21986840), (2, 10993420), (4, 5496710), (5, 4397368), (8, 2748355), (10, 2198684), (20, 1099342), (40, 549671), (61, 360440), (122, 180220), (244, 90110), (305, 72088), (488, 45055), (610, 36044), (1220, 18022), (2440, 9011)]