21000440

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{89}}^1\times {\mathrm{347}}^1$

素因数の和:464

約数の個数: 64

約数和(自身を含む): 50738400

約数和(自身を除く): 29737960

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 85, 89, 136, 170, 178, 340, 347, 356, 445, 680, 694, 712, 890, 1388, 1513, 1735, 1780, 2776, 3026, 3470, 3560, 5899, 6052, 6940, 7565, 11798, 12104, 13880, 15130, 23596, 29495, 30260, 30883, 47192, 58990, 60520, 61766, 117980, 123532, 154415, 235960, 247064, 308830, 525011, 617660, 1050022, 1235320, 2100044, 2625055, 4200088, 5250110, 10500220, 21000440]

約数ペア:

[(1, 21000440), (2, 10500220), (4, 5250110), (5, 4200088), (8, 2625055), (10, 2100044), (17, 1235320), (20, 1050022), (34, 617660), (40, 525011), (68, 308830), (85, 247064), (89, 235960), (136, 154415), (170, 123532), (178, 117980), (340, 61766), (347, 60520), (356, 58990), (445, 47192), (680, 30883), (694, 30260), (712, 29495), (890, 23596), (1388, 15130), (1513, 13880), (1735, 12104), (1780, 11798), (2776, 7565), (3026, 6940), (3470, 6052), (3560, 5899)]