20698880

素因数分解:

$2^8\times 5^1\times {\mathrm{103}}^1\times {\mathrm{157}}^1$

素因数の和:281

約数の個数: 72

約数和(自身を含む): 50380512

約数和(自身を除く): 29681632

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 103, 128, 157, 160, 206, 256, 314, 320, 412, 515, 628, 640, 785, 824, 1030, 1256, 1280, 1570, 1648, 2060, 2512, 3140, 3296, 4120, 5024, 6280, 6592, 8240, 10048, 12560, 13184, 16171, 16480, 20096, 25120, 26368, 32342, 32960, 40192, 50240, 64684, 65920, 80855, 100480, 129368, 131840, 161710, 200960, 258736, 323420, 517472, 646840, 1034944, 1293680, 2069888, 2587360, 4139776, 5174720, 10349440, 20698880]

約数ペア:

[(1, 20698880), (2, 10349440), (4, 5174720), (5, 4139776), (8, 2587360), (10, 2069888), (16, 1293680), (20, 1034944), (32, 646840), (40, 517472), (64, 323420), (80, 258736), (103, 200960), (128, 161710), (157, 131840), (160, 129368), (206, 100480), (256, 80855), (314, 65920), (320, 64684), (412, 50240), (515, 40192), (628, 32960), (640, 32342), (785, 26368), (824, 25120), (1030, 20096), (1256, 16480), (1280, 16171), (1570, 13184), (1648, 12560), (2060, 10048), (2512, 8240), (3140, 6592), (3296, 6280), (4120, 5024)]