21664760

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{61}}^1\times {\mathrm{683}}^1$

素因数の和:768

約数の個数: 64

約数和(自身を含む): 53434080

約数和(自身を除く): 31769320

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, 683, 793, 1220, 1366, 1586, 2440, 2732, 3172, 3415, 3965, 5464, 6344, 6830, 7930, 8879, 13660, 15860, 17758, 27320, 31720, 35516, 41663, 44395, 71032, 83326, 88790, 166652, 177580, 208315, 333304, 355160, 416630, 541619, 833260, 1083238, 1666520, 2166476, 2708095, 4332952, 5416190, 10832380, 21664760]

約数ペア:

[(1, 21664760), (2, 10832380), (4, 5416190), (5, 4332952), (8, 2708095), (10, 2166476), (13, 1666520), (20, 1083238), (26, 833260), (40, 541619), (52, 416630), (61, 355160), (65, 333304), (104, 208315), (122, 177580), (130, 166652), (244, 88790), (260, 83326), (305, 71032), (488, 44395), (520, 41663), (610, 35516), (683, 31720), (793, 27320), (1220, 17758), (1366, 15860), (1586, 13660), (2440, 8879), (2732, 7930), (3172, 6830), (3415, 6344), (3965, 5464)]