21685120

素因数分解:

$2^7\times 5^1\times {\mathrm{31}}^1\times {\mathrm{1093}}^1$

素因数の和:1143

約数の個数: 64

約数和(自身を含む): 53562240

約数和(自身を除く): 31877120

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 32, 40, 62, 64, 80, 124, 128, 155, 160, 248, 310, 320, 496, 620, 640, 992, 1093, 1240, 1984, 2186, 2480, 3968, 4372, 4960, 5465, 8744, 9920, 10930, 17488, 19840, 21860, 33883, 34976, 43720, 67766, 69952, 87440, 135532, 139904, 169415, 174880, 271064, 338830, 349760, 542128, 677660, 699520, 1084256, 1355320, 2168512, 2710640, 4337024, 5421280, 10842560, 21685120]

約数ペア:

[(1, 21685120), (2, 10842560), (4, 5421280), (5, 4337024), (8, 2710640), (10, 2168512), (16, 1355320), (20, 1084256), (31, 699520), (32, 677660), (40, 542128), (62, 349760), (64, 338830), (80, 271064), (124, 174880), (128, 169415), (155, 139904), (160, 135532), (248, 87440), (310, 69952), (320, 67766), (496, 43720), (620, 34976), (640, 33883), (992, 21860), (1093, 19840), (1240, 17488), (1984, 10930), (2186, 9920), (2480, 8744), (3968, 5465), (4372, 4960)]