20939920

素因数分解:

$2^4\times 5^1\times {\mathrm{17}}^1\times {\mathrm{89}}^1\times {\mathrm{173}}^1$

素因数の和:292

約数の個数: 80

約数和(自身を含む): 52429680

約数和(自身を除く): 31489760

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 34, 40, 68, 80, 85, 89, 136, 170, 173, 178, 272, 340, 346, 356, 445, 680, 692, 712, 865, 890, 1360, 1384, 1424, 1513, 1730, 1780, 2768, 2941, 3026, 3460, 3560, 5882, 6052, 6920, 7120, 7565, 11764, 12104, 13840, 14705, 15130, 15397, 23528, 24208, 29410, 30260, 30794, 47056, 58820, 60520, 61588, 76985, 117640, 121040, 123176, 153970, 235280, 246352, 261749, 307940, 523498, 615880, 1046996, 1231760, 1308745, 2093992, 2617490, 4187984, 5234980, 10469960, 20939920]

約数ペア:

[(1, 20939920), (2, 10469960), (4, 5234980), (5, 4187984), (8, 2617490), (10, 2093992), (16, 1308745), (17, 1231760), (20, 1046996), (34, 615880), (40, 523498), (68, 307940), (80, 261749), (85, 246352), (89, 235280), (136, 153970), (170, 123176), (173, 121040), (178, 117640), (272, 76985), (340, 61588), (346, 60520), (356, 58820), (445, 47056), (680, 30794), (692, 30260), (712, 29410), (865, 24208), (890, 23528), (1360, 15397), (1384, 15130), (1424, 14705), (1513, 13840), (1730, 12104), (1780, 11764), (2768, 7565), (2941, 7120), (3026, 6920), (3460, 6052), (3560, 5882)]