21981440

素因数分解:

$2^8\times 5^1\times {\mathrm{13}}^1\times {\mathrm{1321}}^1$

素因数の和:1355

約数の個数: 72

約数和(自身を含む): 56745528

約数和(自身を除く): 34764088

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 32, 40, 52, 64, 65, 80, 104, 128, 130, 160, 208, 256, 260, 320, 416, 520, 640, 832, 1040, 1280, 1321, 1664, 2080, 2642, 3328, 4160, 5284, 6605, 8320, 10568, 13210, 16640, 17173, 21136, 26420, 34346, 42272, 52840, 68692, 84544, 85865, 105680, 137384, 169088, 171730, 211360, 274768, 338176, 343460, 422720, 549536, 686920, 845440, 1099072, 1373840, 1690880, 2198144, 2747680, 4396288, 5495360, 10990720, 21981440]

約数ペア:

[(1, 21981440), (2, 10990720), (4, 5495360), (5, 4396288), (8, 2747680), (10, 2198144), (13, 1690880), (16, 1373840), (20, 1099072), (26, 845440), (32, 686920), (40, 549536), (52, 422720), (64, 343460), (65, 338176), (80, 274768), (104, 211360), (128, 171730), (130, 169088), (160, 137384), (208, 105680), (256, 85865), (260, 84544), (320, 68692), (416, 52840), (520, 42272), (640, 34346), (832, 26420), (1040, 21136), (1280, 17173), (1321, 16640), (1664, 13210), (2080, 10568), (2642, 8320), (3328, 6605), (4160, 5284)]