21151720

素因数分解:

$2^3\times 5^1\times {\mathrm{23}}^1\times {\mathrm{83}}^1\times {\mathrm{277}}^1$

素因数の和:394

約数の個数: 64

約数和(自身を含む): 50440320

約数和(自身を除く): 29288600

約数列:

[1, 2, 4, 5, 8, 10, 20, 23, 40, 46, 83, 92, 115, 166, 184, 230, 277, 332, 415, 460, 554, 664, 830, 920, 1108, 1385, 1660, 1909, 2216, 2770, 3320, 3818, 5540, 6371, 7636, 9545, 11080, 12742, 15272, 19090, 22991, 25484, 31855, 38180, 45982, 50968, 63710, 76360, 91964, 114955, 127420, 183928, 229910, 254840, 459820, 528793, 919640, 1057586, 2115172, 2643965, 4230344, 5287930, 10575860, 21151720]

約数ペア:

[(1, 21151720), (2, 10575860), (4, 5287930), (5, 4230344), (8, 2643965), (10, 2115172), (20, 1057586), (23, 919640), (40, 528793), (46, 459820), (83, 254840), (92, 229910), (115, 183928), (166, 127420), (184, 114955), (230, 91964), (277, 76360), (332, 63710), (415, 50968), (460, 45982), (554, 38180), (664, 31855), (830, 25484), (920, 22991), (1108, 19090), (1385, 15272), (1660, 12742), (1909, 11080), (2216, 9545), (2770, 7636), (3320, 6371), (3818, 5540)]