19965140

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{4517}}^1$

素因数の和:4556

約数の個数: 48

約数和(自身を含む): 47818512

約数和(自身を除く): 27853372

約数列:

[1, 2, 4, 5, 10, 13, 17, 20, 26, 34, 52, 65, 68, 85, 130, 170, 221, 260, 340, 442, 884, 1105, 2210, 4420, 4517, 9034, 18068, 22585, 45170, 58721, 76789, 90340, 117442, 153578, 234884, 293605, 307156, 383945, 587210, 767890, 998257, 1174420, 1535780, 1996514, 3993028, 4991285, 9982570, 19965140]

約数ペア:

[(1, 19965140), (2, 9982570), (4, 4991285), (5, 3993028), (10, 1996514), (13, 1535780), (17, 1174420), (20, 998257), (26, 767890), (34, 587210), (52, 383945), (65, 307156), (68, 293605), (85, 234884), (130, 153578), (170, 117442), (221, 90340), (260, 76789), (340, 58721), (442, 45170), (884, 22585), (1105, 18068), (2210, 9034), (4420, 4517)]