20395960

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{61}}^1\times {\mathrm{643}}^1$

素因数の和:728

約数の個数: 64

約数和(自身を含む): 50309280

約数和(自身を除く): 29913320

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 61, 65, 104, 122, 130, 244, 260, 305, 488, 520, 610, 643, 793, 1220, 1286, 1586, 2440, 2572, 3172, 3215, 3965, 5144, 6344, 6430, 7930, 8359, 12860, 15860, 16718, 25720, 31720, 33436, 39223, 41795, 66872, 78446, 83590, 156892, 167180, 196115, 313784, 334360, 392230, 509899, 784460, 1019798, 1568920, 2039596, 2549495, 4079192, 5098990, 10197980, 20395960]

約数ペア:

[(1, 20395960), (2, 10197980), (4, 5098990), (5, 4079192), (8, 2549495), (10, 2039596), (13, 1568920), (20, 1019798), (26, 784460), (40, 509899), (52, 392230), (61, 334360), (65, 313784), (104, 196115), (122, 167180), (130, 156892), (244, 83590), (260, 78446), (305, 66872), (488, 41795), (520, 39223), (610, 33436), (643, 31720), (793, 25720), (1220, 16718), (1286, 15860), (1586, 12860), (2440, 8359), (2572, 7930), (3172, 6430), (3215, 6344), (3965, 5144)]