77779880

素因数分解:

$2^3\times 5^1\times {\mathrm{61}}^1\times {\mathrm{127}}^1\times {\mathrm{251}}^1$

素因数の和:450

約数の個数: 64

約数和(自身を含む): 179988480

約数和(自身を除く): 102208600

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 61, 122, 127, 244, 251, 254, 305, 488, 502, 508, 610, 635, 1004, 1016, 1220, 1255, 1270, 2008, 2440, 2510, 2540, 5020, 5080, 7747, 10040, 15311, 15494, 30622, 30988, 31877, 38735, 61244, 61976, 63754, 76555, 77470, 122488, 127508, 153110, 154940, 159385, 255016, 306220, 309880, 318770, 612440, 637540, 1275080, 1944497, 3888994, 7777988, 9722485, 15555976, 19444970, 38889940, 77779880]

約数ペア:

[(1, 77779880), (2, 38889940), (4, 19444970), (5, 15555976), (8, 9722485), (10, 7777988), (20, 3888994), (40, 1944497), (61, 1275080), (122, 637540), (127, 612440), (244, 318770), (251, 309880), (254, 306220), (305, 255016), (488, 159385), (502, 154940), (508, 153110), (610, 127508), (635, 122488), (1004, 77470), (1016, 76555), (1220, 63754), (1255, 61976), (1270, 61244), (2008, 38735), (2440, 31877), (2510, 30988), (2540, 30622), (5020, 15494), (5080, 15311), (7747, 10040)]