20570420

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{61}}^1\times {\mathrm{1297}}^1$

素因数の和:1380

約数の個数: 48

約数和(自身を含む): 47319888

約数和(自身を除く): 26749468

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 61, 65, 122, 130, 244, 260, 305, 610, 793, 1220, 1297, 1586, 2594, 3172, 3965, 5188, 6485, 7930, 12970, 15860, 16861, 25940, 33722, 67444, 79117, 84305, 158234, 168610, 316468, 337220, 395585, 791170, 1028521, 1582340, 2057042, 4114084, 5142605, 10285210, 20570420]

約数ペア:

[(1, 20570420), (2, 10285210), (4, 5142605), (5, 4114084), (10, 2057042), (13, 1582340), (20, 1028521), (26, 791170), (52, 395585), (61, 337220), (65, 316468), (122, 168610), (130, 158234), (244, 84305), (260, 79117), (305, 67444), (610, 33722), (793, 25940), (1220, 16861), (1297, 15860), (1586, 12970), (2594, 7930), (3172, 6485), (3965, 5188)]